diff --git a/regtest/basic/rt66dna/1bna.gro b/regtest/basic/rt66dna/1bna.gro
new file mode 100644
index 0000000000000000000000000000000000000000..8d2a4182b2d4d150b2094f1fd9ed9236bcd2dc6e
--- /dev/null
+++ b/regtest/basic/rt66dna/1bna.gro
@@ -0,0 +1,489 @@
+Made with PLUMED t=0.000000
+486
+    1C      O5'    1   1.893   3.419   2.562
+    1C      C5'    2   1.913   3.392   2.422
+    1C      C4'    3   1.996   3.267   2.410
+    1C      O4'    4   1.936   3.158   2.485
+    1C      C3'    5   2.017   3.212   2.269
+    1C      O3'    6   2.135   3.133   2.268
+    1C      C2'    7   1.895   3.122   2.265
+    1C      C1'    8   1.923   3.048   2.394
+    1C       N1    9   1.807   2.966   2.438
+    1C       C2   10   1.822   2.845   2.501
+    1C       O2   11   1.936   2.801   2.521
+    1C       N3   12   1.714   2.776   2.538
+    1C       C4   13   1.592   2.823   2.512
+    1C       N4   14   1.483   2.748   2.544
+    1C       C5   15   1.572   2.944   2.447
+    1C       C6   16   1.684   3.017   2.410
+    2G        P   17   2.241   3.129   2.148
+    2G      OP1   18   2.354   3.216   2.185
+    2G      OP2   19   2.182   3.146   2.014
+    2G      O5'   20   2.284   2.975   2.150
+    2G      C5'   21   2.354   2.917   2.259
+    2G      C4'   22   2.349   2.771   2.228
+    2G      O4'   23   2.219   2.725   2.267
+    2G      C3'   24   2.369   2.733   2.081
+    2G      O3'   25   2.472   2.632   2.065
+    2G      C2'   26   2.227   2.689   2.042
+    2G      C1'   27   2.172   2.630   2.172
+    2G       N9   28   2.024   2.647   2.178
+    2G       C8   29   1.953   2.758   2.143
+    2G       N7   30   1.821   2.745   2.164
+    2G       C5   31   1.808   2.621   2.214
+    2G       C6   32   1.690   2.552   2.255
+    2G       O6   33   1.574   2.592   2.252
+    2G       N1   34   1.720   2.428   2.304
+    2G       C2   35   1.843   2.372   2.316
+    2G       N2   36   1.851   2.246   2.367
+    2G       N3   37   1.954   2.436   2.277
+    2G       C4   38   1.929   2.559   2.227
+    3C        P   39   2.506   2.562   1.925
+    3C      OP1   40   2.651   2.532   1.922
+    3C      OP2   41   2.456   2.641   1.811
+    3C      O5'   42   2.426   2.425   1.933
+    3C      C5'   43   2.458   2.328   2.033
+    3C      C4'   44   2.352   2.223   2.025
+    3C      O4'   45   2.226   2.284   2.045
+    3C      C3'   46   2.342   2.156   1.890
+    3C      O3'   47   2.412   2.031   1.893
+    3C      C2'   48   2.193   2.141   1.866
+    3C      C1'   49   2.128   2.197   1.991
+    3C       N1   50   2.020   2.289   1.952
+    3C       C2   51   1.891   2.258   1.982
+    3C       O2   52   1.868   2.151   2.038
+    3C       N3   53   1.793   2.345   1.950
+    3C       C4   54   1.822   2.460   1.890
+    3C       N4   55   1.722   2.550   1.863
+    3C       C5   56   1.953   2.494   1.857
+    3C       C6   57   2.054   2.405   1.890
+    4G        P   58   2.425   1.941   1.762
+    4G      OP1   59   2.542   1.853   1.776
+    4G      OP2   60   2.421   2.030   1.644
+    4G      O5'   61   2.293   1.854   1.767
+    4G      C5'   62   2.271   1.762   1.875
+    4G      C4'   63   2.139   1.696   1.850
+    4G      O4'   64   2.035   1.795   1.850
+    4G      C3'   65   2.126   1.623   1.718
+    4G      O3'   66   2.028   1.521   1.724
+    4G      C2'   67   2.079   1.737   1.629
+    4G      C1'   68   1.972   1.790   1.722
+    4G       N9   69   1.931   1.928   1.687
+    4G       C8   70   2.002   2.026   1.623
+    4G       N7   71   1.931   2.139   1.608
+    4G       C5   72   1.812   2.110   1.664
+    4G       C6   73   1.695   2.190   1.675
+    4G       O6   74   1.677   2.306   1.637
+    4G       N1   75   1.593   2.121   1.735
+    4G       C2   76   1.597   1.993   1.782
+    4G       N2   77   1.483   1.942   1.835
+    4G       N3   78   1.707   1.918   1.772
+    4G       C4   79   1.808   1.983   1.712
+    5A        P   80   2.036   1.397   1.625
+    5A      OP1   81   2.112   1.289   1.689
+    5A      OP2   82   2.084   1.442   1.491
+    5A      O5'   83   1.881   1.358   1.616
+    5A      C5'   84   1.801   1.357   1.736
+    5A      C4'   85   1.667   1.409   1.696
+    5A      O4'   86   1.684   1.545   1.656
+    5A      C3'   87   1.602   1.339   1.576
+    5A      O3'   88   1.476   1.280   1.612
+    5A      C2'   89   1.595   1.450   1.470
+    5A      C1'   90   1.585   1.573   1.557
+    5A       N9   91   1.639   1.692   1.487
+    5A       C8   92   1.766   1.710   1.438
+    5A       N7   93   1.786   1.835   1.391
+    5A       C5   94   1.667   1.895   1.410
+    5A       C6   95   1.623   2.028   1.382
+    5A       N6   96   1.705   2.122   1.327
+    5A       N1   97   1.497   2.058   1.412
+    5A       C2   98   1.418   1.965   1.467
+    5A       N3   99   1.446   1.839   1.498
+    5A       C4  100   1.575   1.811   1.466
+    6A        P  101   1.387   1.201   1.506
+    6A      OP1  102   1.303   1.104   1.580
+    6A      OP2  103   1.472   1.150   1.397
+    6A      O5'  104   1.288   1.311   1.448
+    6A      C5'  105   1.180   1.360   1.529
+    6A      C4'  106   1.111   1.460   1.444
+    6A      O4'  107   1.215   1.546   1.396
+    6A      C3'  108   1.042   1.407   1.319
+    6A      O3'  109   0.901   1.437   1.318
+    6A      C2'  110   1.124   1.469   1.206
+    6A      C1'  111   1.170   1.597   1.272
+    6A       N9  112   1.292   1.653   1.208
+    6A       C8  113   1.411   1.590   1.187
+    6A       N7  114   1.505   1.671   1.136
+    6A       C5  115   1.442   1.790   1.125
+    6A       C6  116   1.487   1.919   1.081
+    6A       N6  117   1.616   1.942   1.043
+    6A       N1  118   1.400   2.019   1.085
+    6A       C2  119   1.275   1.996   1.127
+    6A       N3  120   1.221   1.882   1.170
+    6A       C4  121   1.312   1.782   1.166
+    7T        P  122   0.808   1.405   1.191
+    7T      OP1  123   0.667   1.396   1.234
+    7T      OP2  124   0.860   1.289   1.114
+    7T      O5'  125   0.824   1.539   1.108
+    7T      C5'  126   0.791   1.664   1.169
+    7T      C4'  127   0.816   1.763   1.060
+    7T      O4'  128   0.954   1.758   1.028
+    7T      C3'  129   0.746   1.728   0.930
+    7T      O3'  130   0.625   1.803   0.916
+    7T      C2'  131   0.853   1.753   0.822
+    7T      C1'  132   0.964   1.821   0.902
+    7T       N1  133   1.102   1.790   0.856
+    7T       C2  134   1.182   1.892   0.818
+    7T       O2  135   1.138   2.008   0.814
+    7T       N3  136   1.312   1.864   0.785
+    7T       C4  137   1.363   1.737   0.788
+    7T       O4  138   1.483   1.722   0.762
+    7T       C5  139   1.278   1.633   0.823
+    7T       C7  140   1.327   1.490   0.824
+    7T       C6  141   1.147   1.662   0.859
+    8T        P  142   0.538   1.799   0.782
+    8T      OP1  143   0.403   1.844   0.818
+    8T      OP2  144   0.546   1.667   0.716
+    8T      O5'  145   0.609   1.912   0.693
+    8T      C5'  146   0.615   2.048   0.742
+    8T      C4'  147   0.699   2.123   0.644
+    8T      O4'  148   0.819   2.046   0.628
+    8T      C3'  149   0.642   2.133   0.503
+    8T      O3'  150   0.597   2.267   0.470
+    8T      C2'  151   0.751   2.072   0.414
+    8T      C1'  152   0.874   2.085   0.503
+    8T       N1  153   0.982   1.988   0.476
+    8T       C2  154   1.109   2.032   0.449
+    8T       O2  155   1.132   2.152   0.439
+    8T       N3  156   1.209   1.940   0.441
+    8T       C4  157   1.188   1.806   0.455
+    8T       O4  158   1.286   1.732   0.450
+    8T       C5  159   1.057   1.761   0.476
+    8T       C7  160   1.026   1.614   0.490
+    8T       C6  161   0.955   1.855   0.490
+    9C        P  162   0.553   2.307   0.321
+    9C      OP1  163   0.465   2.424   0.327
+    9C      OP2  164   0.501   2.191   0.247
+    9C      O5'  165   0.693   2.355   0.261
+    9C      C5'  166   0.764   2.463   0.325
+    9C      C4'  167   0.890   2.485   0.246
+    9C      O4'  168   0.964   2.363   0.245
+    9C      C3'  169   0.872   2.524   0.100
+    9C      O3'  170   0.947   2.641   0.067
+    9C      C2'  171   0.913   2.397   0.025
+    9C      C1'  172   1.024   2.348   0.116
+    9C       N1  173   1.052   2.202   0.101
+    9C       C2  174   1.181   2.160   0.084
+    9C       O2  175   1.269   2.245   0.067
+    9C       N3  176   1.211   2.030   0.087
+    9C       C4  177   1.114   1.940   0.105
+    9C       N4  178   1.146   1.808   0.109
+    9C       C5  179   0.980   1.977   0.118
+    9C       C6  180   0.950   2.113   0.117
+   10G        P  181   0.906   2.733  -0.058
+   10G      OP1  182   0.950   2.872  -0.026
+   10G      OP2  183   0.763   2.711  -0.095
+   10G      O5'  184   0.995   2.676  -0.177
+   10G      C5'  185   1.138   2.694  -0.172
+   10G      C4'  186   1.197   2.609  -0.280
+   10G      O4'  187   1.180   2.472  -0.240
+   10G      C3'  188   1.133   2.618  -0.419
+   10G      O3'  189   1.231   2.610  -0.521
+   10G      C2'  190   1.041   2.496  -0.419
+   10G      C1'  191   1.143   2.403  -0.359
+   10G       N9  192   1.089   2.271  -0.320
+   10G       C8  193   0.962   2.232  -0.291
+   10G       N7  194   0.954   2.101  -0.261
+   10G       C5  195   1.082   2.059  -0.272
+   10G       C6  196   1.138   1.929  -0.251
+   10G       O6  197   1.081   1.825  -0.218
+   10G       N1  198   1.273   1.930  -0.272
+   10G       C2  199   1.350   2.036  -0.308
+   10G       N2  200   1.483   2.017  -0.324
+   10G       N3  201   1.298   2.157  -0.327
+   10G       C4  202   1.166   2.160  -0.306
+   11C        P  203   1.276   2.742  -0.598
+   11C      OP1  204   1.280   2.857  -0.505
+   11C      OP2  205   1.189   2.754  -0.716
+   11C      O5'  206   1.427   2.709  -0.637
+   11C      C5'  207   1.527   2.711  -0.532
+   11C      C4'  208   1.622   2.595  -0.551
+   11C      O4'  209   1.544   2.475  -0.540
+   11C      C3'  210   1.694   2.583  -0.685
+   11C      O3'  211   1.834   2.551  -0.670
+   11C      C2'  212   1.612   2.477  -0.758
+   11C      C1'  213   1.586   2.384  -0.641
+   11C       N1  214   1.467   2.298  -0.664
+   11C       C2  215   1.480   2.163  -0.653
+   11C       O2  216   1.592   2.118  -0.631
+   11C       N3  217   1.372   2.084  -0.663
+   11C       C4  218   1.252   2.137  -0.684
+   11C       N4  219   1.141   2.057  -0.687
+   11C       C5  220   1.235   2.274  -0.698
+   11C       C6  221   1.347   2.356  -0.687
+   12G        P  222   1.933   2.577  -0.793
+   12G      OP1  223   2.070   2.598  -0.741
+   12G      OP2  224   1.876   2.685  -0.876
+   12G      O5'  225   1.930   2.441  -0.876
+   12G      C5'  226   2.011   2.328  -0.836
+   12G      C4'  227   1.975   2.217  -0.930
+   12G      O4'  228   1.835   2.197  -0.914
+   12G      C3'  229   1.992   2.240  -1.081
+   12G      O3'  230   2.099   2.164  -1.140
+   12G      C2'  231   1.853   2.206  -1.138
+   12G      C1'  232   1.797   2.120  -1.027
+   12G       N9  233   1.649   2.122  -1.027
+   12G       C8  234   1.566   2.229  -1.048
+   12G       N7  235   1.437   2.196  -1.039
+   12G       C5  236   1.439   2.064  -1.010
+   12G       C6  237   1.330   1.974  -0.986
+   12G       O6  238   1.209   1.997  -0.986
+   12G       N1  239   1.375   1.847  -0.963
+   12G       C2  240   1.504   1.804  -0.960
+   12G       N2  241   1.526   1.672  -0.941
+   12G       N3  242   1.606   1.889  -0.979
+   12G       C4  243   1.566   2.016  -1.003
+   13DC     O5'  244   0.746   1.188  -0.907
+   13DC     C5'  245   0.825   1.097  -0.985
+   13DC     C4'  246   0.971   1.114  -0.951
+   13DC     O4'  247   1.014   1.245  -0.991
+   13DC     C3'  248   1.010   1.099  -0.806
+   13DC     O3'  249   1.129   1.022  -0.790
+   13DC     C2'  250   1.025   1.244  -0.761
+   13DC     C1'  251   1.090   1.304  -0.884
+   13DC      N1  252   1.057   1.449  -0.894
+   13DC      C2  253   1.156   1.543  -0.901
+   13DC      O2  254   1.273   1.507  -0.893
+   13DC      N3  255   1.125   1.671  -0.919
+   13DC      C4  256   0.998   1.709  -0.933
+   13DC      N4  257   0.970   1.840  -0.959
+   13DC      C5  258   0.894   1.616  -0.927
+   13DC      C6  259   0.927   1.482  -0.908
+   14DG       P  260   1.160   0.951  -0.650
+   14DG     OP1  261   1.167   0.803  -0.666
+   14DG     OP2  262   1.064   1.001  -0.549
+   14DG     O5'  263   1.305   1.009  -0.618
+   14DG     C5'  264   1.410   1.002  -0.716
+   14DG     C4'  265   1.511   1.099  -0.666
+   14DG     O4'  266   1.456   1.230  -0.676
+   14DG     C3'  267   1.544   1.081  -0.519
+   14DG     O3'  268   1.684   1.056  -0.501
+   14DG     C2'  269   1.494   1.210  -0.453
+   14DG     C1'  270   1.506   1.309  -0.567
+   14DG      N9  271   1.404   1.414  -0.554
+   14DG      C8  272   1.271   1.396  -0.526
+   14DG      N7  273   1.202   1.510  -0.527
+   14DG      C5  274   1.294   1.604  -0.556
+   14DG      C6  275   1.276   1.745  -0.571
+   14DG      O6  276   1.172   1.811  -0.563
+   14DG      N1  277   1.395   1.808  -0.597
+   14DG      C2  278   1.517   1.749  -0.611
+   14DG      N2  279   1.624   1.829  -0.632
+   14DG      N3  280   1.533   1.616  -0.599
+   14DG      C4  281   1.418   1.550  -0.572
+   15DC       P  282   1.748   1.038  -0.357
+   15DC     OP1  283   1.867   0.952  -0.373
+   15DC     OP2  284   1.643   0.994  -0.263
+   15DC     O5'  285   1.796   1.186  -0.321
+   15DC     C5'  286   1.896   1.253  -0.400
+   15DC     C4'  287   1.894   1.396  -0.354
+   15DC     O4'  288   1.759   1.441  -0.362
+   15DC     C3'  289   1.925   1.414  -0.207
+   15DC     O3'  290   2.066   1.422  -0.186
+   15DC     C2'  291   1.852   1.542  -0.173
+   15DC     C1'  292   1.755   1.560  -0.287
+   15DC      N1  293   1.615   1.570  -0.243
+   15DC      C2  294   1.551   1.689  -0.256
+   15DC      O2  295   1.616   1.785  -0.296
+   15DC      N3  296   1.421   1.698  -0.226
+   15DC      C4  297   1.354   1.592  -0.183
+   15DC      N4  298   1.220   1.602  -0.155
+   15DC      C5  299   1.416   1.469  -0.165
+   15DC      C6  300   1.551   1.458  -0.198
+   16DG       P  301   2.130   1.453  -0.044
+   16DG     OP1  302   2.270   1.409  -0.052
+   16DG     OP2  303   2.049   1.395   0.065
+   16DG     O5'  304   2.131   1.612  -0.036
+   16DG     C5'  305   2.218   1.688  -0.121
+   16DG     C4'  306   2.174   1.829  -0.102
+   16DG     O4'  307   2.031   1.823  -0.105
+   16DG     C3'  308   2.210   1.896   0.029
+   16DG     O3'  309   2.259   2.029   0.010
+   16DG     C2'  310   2.082   1.883   0.112
+   16DG     C1'  311   1.976   1.899   0.005
+   16DG      N9  312   1.851   1.830   0.047
+   16DG      C8  313   1.836   1.706   0.104
+   16DG      N7  314   1.708   1.674   0.128
+   16DG      C5  315   1.640   1.783   0.087
+   16DG      C6  316   1.500   1.809   0.088
+   16DG      O6  317   1.408   1.738   0.128
+   16DG      N1  318   1.471   1.935   0.042
+   16DG      C2  319   1.561   2.027  -0.003
+   16DG      N2  320   1.513   2.149  -0.038
+   16DG      N3  321   1.691   2.002  -0.007
+   16DG      C4  322   1.724   1.879   0.038
+   17DA       P  323   2.290   2.124   0.134
+   17DA     OP1  324   2.399   2.218   0.102
+   17DA     OP2  325   2.310   2.039   0.254
+   17DA     O5'  326   2.158   2.211   0.139
+   17DA     C5'  327   2.122   2.283   0.020
+   17DA     C4'  328   2.010   2.379   0.048
+   17DA     O4'  329   1.891   2.305   0.082
+   17DA     C3'  330   2.035   2.474   0.163
+   17DA     O3'  331   1.973   2.601   0.141
+   17DA     C2'  332   1.975   2.394   0.279
+   17DA     C1'  333   1.850   2.339   0.214
+   17DA      N9  334   1.808   2.209   0.276
+   17DA      C8  335   1.885   2.102   0.313
+   17DA      N7  336   1.811   1.998   0.358
+   17DA      C5  337   1.684   2.042   0.349
+   17DA      C6  338   1.558   1.982   0.379
+   17DA      N6  339   1.545   1.854   0.424
+   17DA      N1  340   1.448   2.056   0.359
+   17DA      C2  341   1.460   2.180   0.312
+   17DA      N3  342   1.570   2.247   0.278
+   17DA      C4  343   1.679   2.171   0.300
+   18DA       P  344   1.980   2.714   0.253
+   18DA     OP1  345   1.980   2.848   0.189
+   18DA     OP2  346   2.095   2.686   0.343
+   18DA     O5'  347   1.840   2.694   0.324
+   18DA     C5'  348   1.720   2.703   0.245
+   18DA     C4'  349   1.603   2.696   0.339
+   18DA     O4'  350   1.586   2.561   0.385
+   18DA     C3'  351   1.610   2.786   0.461
+   18DA     O3'  352   1.489   2.861   0.476
+   18DA     C2'  353   1.637   2.684   0.572
+   18DA     C1'  354   1.556   2.566   0.524
+   18DA      N9  355   1.610   2.437   0.576
+   18DA      C8  356   1.741   2.397   0.583
+   18DA      N7  357   1.754   2.271   0.628
+   18DA      C5  358   1.627   2.231   0.648
+   18DA      C6  359   1.572   2.107   0.693
+   18DA      N6  360   1.648   1.999   0.724
+   18DA      N1  361   1.439   2.099   0.704
+   18DA      C2  362   1.364   2.204   0.671
+   18DA      N3  363   1.402   2.323   0.626
+   18DA      C4  364   1.537   2.329   0.617
+   19DT       P  365   1.460   2.955   0.602
+   19DT     OP1  366   1.379   3.070   0.558
+   19DT     OP2  367   1.585   2.984   0.675
+   19DT     O5'  368   1.363   2.863   0.689
+   19DT     C5'  369   1.240   2.817   0.630
+   19DT     C4'  370   1.181   2.722   0.730
+   19DT     O4'  371   1.277   2.618   0.753
+   19DT     C3'  372   1.152   2.782   0.867
+   19DT     O3'  373   1.010   2.795   0.889
+   19DT     C2'  374   1.227   2.691   0.963
+   19DT     C1'  375   1.243   2.565   0.880
+   19DT      N1  376   1.361   2.485   0.920
+   19DT      C2  377   1.344   2.358   0.966
+   19DT      O2  378   1.231   2.310   0.980
+   19DT      N3  379   1.455   2.283   0.991
+   19DT      C4  380   1.581   2.332   0.978
+   19DT      O4  381   1.675   2.257   1.003
+   19DT      C5  382   1.597   2.465   0.936
+   19DT      C7  383   1.734   2.524   0.923
+   19DT      C6  384   1.484   2.541   0.905
+   20DT       P  385   0.951   2.853   1.026
+   20DT     OP1  386   0.815   2.901   1.000
+   20DT     OP2  387   1.045   2.951   1.084
+   20DT     O5'  388   0.940   2.722   1.115
+   20DT     C5'  389   0.858   2.615   1.066
+   20DT     C4'  390   0.865   2.506   1.168
+   20DT     O4'  391   1.000   2.461   1.176
+   20DT     C3'  392   0.827   2.547   1.309
+   20DT     O3'  393   0.720   2.466   1.355
+   20DT     C2'  394   0.959   2.531   1.386
+   20DT     C1'  395   1.019   2.415   1.309
+   20DT      N1  396   1.166   2.407   1.320
+   20DT      C2  397   1.226   2.288   1.349
+   20DT      O2  398   1.158   2.187   1.369
+   20DT      N3  399   1.362   2.283   1.350
+   20DT      C4  400   1.440   2.391   1.323
+   20DT      O4  401   1.562   2.376   1.325
+   20DT      C5  402   1.377   2.513   1.293
+   20DT      C7  403   1.456   2.636   1.261
+   20DT      C6  404   1.239   2.519   1.293
+   21DC       P  405   0.659   2.482   1.502
+   21DC     OP1  406   0.517   2.442   1.499
+   21DC     OP2  407   0.687   2.619   1.551
+   21DC     O5'  408   0.741   2.373   1.584
+   21DC     C5'  409   0.733   2.235   1.543
+   21DC     C4'  410   0.810   2.160   1.646
+   21DC     O4'  411   0.948   2.190   1.626
+   21DC     C3'  412   0.777   2.205   1.788
+   21DC     O3'  413   0.704   2.104   1.861
+   21DC     C2'  414   0.912   2.241   1.847
+   21DC     C1'  415   1.011   2.174   1.752
+   21DC      N1  416   1.133   2.256   1.733
+   21DC      C2  417   1.253   2.194   1.733
+   21DC      O2  418   1.256   2.073   1.758
+   21DC      N3  419   1.364   2.264   1.703
+   21DC      C4  420   1.356   2.394   1.674
+   21DC      N4  421   1.469   2.463   1.640
+   21DC      C5  422   1.234   2.461   1.674
+   21DC      C6  423   1.119   2.388   1.703
+   22DG       P  424   0.651   2.132   2.010
+   22DG     OP1  425   0.539   2.040   2.040
+   22DG     OP2  426   0.624   2.277   2.031
+   22DG     O5'  427   0.777   2.092   2.099
+   22DG     C5'  428   0.822   1.956   2.107
+   22DG     C4'  429   0.942   1.956   2.198
+   22DG     O4'  430   1.049   2.026   2.132
+   22DG     C3'  431   0.927   2.027   2.333
+   22DG     O3'  432   1.009   1.966   2.429
+   22DG     C2'  433   0.975   2.167   2.299
+   22DG     C1'  434   1.099   2.123   2.226
+   22DG      N9  435   1.160   2.236   2.154
+   22DG      C8  436   1.104   2.355   2.116
+   22DG      N7  437   1.192   2.436   2.057
+   22DG      C5  438   1.307   2.365   2.058
+   22DG      C6  439   1.437   2.400   2.010
+   22DG      O6  440   1.475   2.506   1.958
+   22DG      N1  441   1.527   2.298   2.031
+   22DG      C2  442   1.502   2.178   2.089
+   22DG      N2  443   1.607   2.091   2.104
+   22DG      N3  444   1.381   2.145   2.135
+   22DG      C4  445   1.290   2.243   2.115
+   23DC       P  446   0.948   1.863   2.534
+   23DC     OP1  447   0.877   1.753   2.463
+   23DC     OP2  448   0.867   1.941   2.631
+   23DC     O5'  449   1.081   1.807   2.603
+   23DC     C5'  450   1.169   1.717   2.531
+   23DC     C4'  451   1.311   1.757   2.559
+   23DC     O4'  452   1.328   1.880   2.489
+   23DC     C3'  453   1.344   1.788   2.706
+   23DC     O3'  454   1.434   1.694   2.768
+   23DC     C2'  455   1.393   1.932   2.702
+   23DC     C1'  456   1.431   1.951   2.557
+   23DC      N1  457   1.414   2.093   2.517
+   23DC      C2  458   1.520   2.159   2.463
+   23DC      O2  459   1.626   2.098   2.450
+   23DC      N3  460   1.507   2.288   2.426
+   23DC      C4  461   1.390   2.351   2.440
+   23DC      N4  462   1.377   2.481   2.402
+   23DC      C5  463   1.280   2.287   2.497
+   23DC      C6  464   1.294   2.154   2.536
+   24DG       P  465   1.466   1.706   2.925
+   24DG     OP1  466   1.486   1.572   2.983
+   24DG     OP2  467   1.363   1.791   2.992
+   24DG     O5'  468   1.603   1.788   2.928
+   24DG     C5'  469   1.724   1.732   2.874
+   24DG     C4'  470   1.821   1.846   2.876
+   24DG     O4'  471   1.772   1.943   2.783
+   24DG     C3'  472   1.823   1.924   3.006
+   24DG     O3'  473   1.898   1.858   3.108
+   24DG     C2'  474   1.889   2.052   2.958
+   24DG     C1'  475   1.828   2.069   2.819
+   24DG      N9  476   1.716   2.166   2.814
+   24DG      C8  477   1.587   2.154   2.858
+   24DG      N7  478   1.513   2.261   2.831
+   24DG      C5  479   1.599   2.344   2.767
+   24DG      C6  480   1.577   2.473   2.712
+   24DG      O6  481   1.472   2.537   2.707
+   24DG      N1  482   1.693   2.526   2.660
+   24DG      C2  483   1.816   2.467   2.658
+   24DG      N2  484   1.921   2.539   2.610
+   24DG      N3  485   1.835   2.344   2.705
+   24DG      C4  486   1.723   2.289   2.757
+   0.0000000    0.0000000    0.0000000    0.0000000    0.0000000    0.0000000    0.0000000    0.0000000    0.0000000
diff --git a/regtest/basic/rt66dna/1bna.pdb b/regtest/basic/rt66dna/1bna.pdb
new file mode 100644
index 0000000000000000000000000000000000000000..d4e4aa2f7d814df97adae5ad398de345a2fe7cfe
--- /dev/null
+++ b/regtest/basic/rt66dna/1bna.pdb
@@ -0,0 +1,488 @@
+CRYST1    0.000    0.000    0.000  90.00  90.00  90.00 P 1           1
+ATOM      1  O5' C   A   1      18.935  34.195  25.617  1.00 64.35           O
+ATOM      2  C5' C   A   1      19.130  33.921  24.219  1.00 44.69           C
+ATOM      3  C4' C   A   1      19.961  32.668  24.100  1.00 31.28           C
+ATOM      4  O4' C   A   1      19.360  31.583  24.852  1.00 37.45           O
+ATOM      5  C3' C   A   1      20.172  32.122  22.694  1.00 46.72           C
+ATOM      6  O3' C   A   1      21.350  31.325  22.681  1.00 48.89           O
+ATOM      7  C2' C   A   1      18.948  31.223  22.647  1.00 30.88           C
+ATOM      8  C1' C   A   1      19.231  30.482  23.944  1.00 36.58           C
+ATOM      9  N1  C   A   1      18.070  29.661  24.380  1.00 40.51           N
+ATOM     10  C2  C   A   1      18.224  28.454  25.015  1.00 16.62           C
+ATOM     11  O2  C   A   1      19.360  28.014  25.214  1.00 27.75           O
+ATOM     12  N3  C   A   1      17.143  27.761  25.377  1.00 20.55           N
+ATOM     13  C4  C   A   1      15.917  28.226  25.120  1.00 34.72           C
+ATOM     14  N4  C   A   1      14.828  27.477  25.444  1.00 40.31           N
+ATOM     15  C5  C   A   1      15.719  29.442  24.471  1.00 30.78           C
+ATOM     16  C6  C   A   1      16.843  30.171  24.101  1.00 25.90           C
+ATOM     17  P   G   A   2      22.409  31.286  21.483  1.00 58.85           P
+ATOM     18  OP1 G   A   2      23.536  32.157  21.851  1.00 57.82           O
+ATOM     19  OP2 G   A   2      21.822  31.459  20.139  1.00 78.33           O
+ATOM     20  O5' G   A   2      22.840  29.751  21.498  1.00 40.36           O
+ATOM     21  C5' G   A   2      23.543  29.175  22.594  1.00 47.19           C
+ATOM     22  C4' G   A   2      23.494  27.709  22.279  1.00 47.81           C
+ATOM     23  O4' G   A   2      22.193  27.252  22.674  1.00 38.76           O
+ATOM     24  C3' G   A   2      23.693  27.325  20.807  1.00 28.58           C
+ATOM     25  O3' G   A   2      24.723  26.320  20.653  1.00 40.44           O
+ATOM     26  C2' G   A   2      22.273  26.885  20.416  1.00 21.14           C
+ATOM     27  C1' G   A   2      21.721  26.304  21.716  1.00 33.95           C
+ATOM     28  N9  G   A   2      20.237  26.470  21.780  1.00 34.00           N
+ATOM     29  C8  G   A   2      19.526  27.584  21.429  1.00 36.47           C
+ATOM     30  N7  G   A   2      18.207  27.455  21.636  1.00 32.37           N
+ATOM     31  C5  G   A   2      18.083  26.212  22.142  1.00 15.06           C
+ATOM     32  C6  G   A   2      16.904  25.525  22.545  1.00 11.88           C
+ATOM     33  O6  G   A   2      15.739  25.916  22.518  1.00 21.30           O
+ATOM     34  N1  G   A   2      17.197  24.279  23.037  1.00 15.44           N
+ATOM     35  C2  G   A   2      18.434  23.717  23.155  1.00  9.63           C
+ATOM     36  N2  G   A   2      18.508  22.456  23.668  1.00 16.69           N
+ATOM     37  N3  G   A   2      19.537  24.360  22.770  1.00 30.98           N
+ATOM     38  C4  G   A   2      19.290  25.594  22.274  1.00 18.56           C
+ATOM     39  P   C   A   3      25.064  25.621  19.252  1.00 44.67           P
+ATOM     40  OP1 C   A   3      26.506  25.316  19.220  1.00 53.89           O
+ATOM     41  OP2 C   A   3      24.559  26.412  18.115  1.00 57.79           O
+ATOM     42  O5' C   A   3      24.260  24.246  19.327  1.00 35.42           O
+ATOM     43  C5' C   A   3      24.584  23.285  20.335  1.00 45.75           C
+ATOM     44  C4' C   A   3      23.523  22.233  20.245  1.00 43.02           C
+ATOM     45  O4' C   A   3      22.256  22.844  20.453  1.00 36.85           O
+ATOM     46  C3' C   A   3      23.424  21.557  18.903  1.00 40.14           C
+ATOM     47  O3' C   A   3      24.121  20.309  18.928  1.00 49.62           O
+ATOM     48  C2' C   A   3      21.930  21.406  18.661  1.00 53.79           C
+ATOM     49  C1' C   A   3      21.278  21.966  19.909  1.00 22.18           C
+ATOM     50  N1  C   A   3      20.196  22.889  19.521  1.00 25.44           N
+ATOM     51  C2  C   A   3      18.909  22.584  19.816  1.00 19.81           C
+ATOM     52  O2  C   A   3      18.685  21.512  20.382  1.00 29.92           O
+ATOM     53  N3  C   A   3      17.935  23.447  19.502  1.00 21.59           N
+ATOM     54  C4  C   A   3      18.217  24.603  18.897  1.00 14.01           C
+ATOM     55  N4  C   A   3      17.221  25.499  18.629  1.00 26.88           N
+ATOM     56  C5  C   A   3      19.526  24.945  18.571  1.00 27.59           C
+ATOM     57  C6  C   A   3      20.537  24.048  18.899  1.00 27.05           C
+ATOM     58  P   G   A   4      24.249  19.412  17.617  1.00 44.54           P
+ATOM     59  OP1 G   A   4      25.420  18.535  17.765  1.00 61.90           O
+ATOM     60  OP2 G   A   4      24.208  20.296  16.440  1.00 37.36           O
+ATOM     61  O5' G   A   4      22.931  18.537  17.670  1.00 32.01           O
+ATOM     62  C5' G   A   4      22.714  17.625  18.753  1.00 37.89           C
+ATOM     63  C4' G   A   4      21.393  16.960  18.505  1.00 53.00           C
+ATOM     64  O4' G   A   4      20.353  17.952  18.496  1.00 38.79           O
+ATOM     65  C3' G   A   4      21.264  16.229  17.176  1.00 56.72           C
+ATOM     66  O3' G   A   4      20.284  15.214  17.238  1.00 64.12           O
+ATOM     67  C2' G   A   4      20.793  17.368  16.288  1.00 40.81           C
+ATOM     68  C1' G   A   4      19.716  17.901  17.218  1.00 30.52           C
+ATOM     69  N9  G   A   4      19.305  19.281  16.869  1.00 28.53           N
+ATOM     70  C8  G   A   4      20.017  20.263  16.232  1.00 27.82           C
+ATOM     71  N7  G   A   4      19.313  21.394  16.077  1.00 28.01           N
+ATOM     72  C5  G   A   4      18.121  21.100  16.635  1.00 23.22           C
+ATOM     73  C6  G   A   4      16.952  21.904  16.749  1.00 29.21           C
+ATOM     74  O6  G   A   4      16.769  23.057  16.368  1.00 38.58           O
+ATOM     75  N1  G   A   4      15.933  21.214  17.352  1.00 27.94           N
+ATOM     76  C2  G   A   4      15.972  19.930  17.816  1.00 23.44           C
+ATOM     77  N2  G   A   4      14.831  19.416  18.353  1.00 42.64           N
+ATOM     78  N3  G   A   4      17.068  19.179  17.717  1.00 21.56           N
+ATOM     79  C4  G   A   4      18.084  19.825  17.121  1.00 23.44           C
+ATOM     80  P   A   A   5      20.356  13.969  16.245  1.00 57.01           P
+ATOM     81  OP1 A   A   5      21.116  12.891  16.892  1.00 58.59           O
+ATOM     82  OP2 A   A   5      20.837  14.423  14.910  1.00 51.96           O
+ATOM     83  O5' A   A   5      18.810  13.581  16.161  1.00 47.12           O
+ATOM     84  C5' A   A   5      18.015  13.569  17.362  1.00 47.67           C
+ATOM     85  C4' A   A   5      16.672  14.088  16.957  1.00 64.79           C
+ATOM     86  O4' A   A   5      16.842  15.447  16.561  1.00 47.60           O
+ATOM     87  C3' A   A   5      16.019  13.393  15.764  1.00 51.50           C
+ATOM     88  O3' A   A   5      14.762  12.796  16.120  1.00 52.18           O
+ATOM     89  C2' A   A   5      15.952  14.498  14.696  1.00 45.00           C
+ATOM     90  C1' A   A   5      15.851  15.732  15.569  1.00 26.88           C
+ATOM     91  N9  A   A   5      16.391  16.916  14.867  1.00 16.69           N
+ATOM     92  C8  A   A   5      17.658  17.103  14.382  1.00 28.14           C
+ATOM     93  N7  A   A   5      17.863  18.346  13.913  1.00 34.85           N
+ATOM     94  C5  A   A   5      16.673  18.953  14.098  1.00 22.49           C
+ATOM     95  C6  A   A   5      16.230  20.279  13.819  1.00 18.12           C
+ATOM     96  N6  A   A   5      17.045  21.222  13.268  1.00 29.30           N
+ATOM     97  N1  A   A   5      14.966  20.578  14.118  1.00 27.61           N
+ATOM     98  C2  A   A   5      14.178  19.652  14.669  1.00 18.53           C
+ATOM     99  N3  A   A   5      14.463  18.392  14.984  1.00 29.16           N
+ATOM    100  C4  A   A   5      15.750  18.110  14.661  1.00 15.08           C
+ATOM    101  P   A   A   6      13.866  12.006  15.063  1.00 43.68           P
+ATOM    102  OP1 A   A   6      13.028  11.039  15.800  1.00 42.55           O
+ATOM    103  OP2 A   A   6      14.715  11.499  13.968  1.00 54.20           O
+ATOM    104  O5' A   A   6      12.879  13.111  14.480  1.00 28.20           O
+ATOM    105  C5' A   A   6      11.802  13.597  15.290  1.00 42.29           C
+ATOM    106  C4' A   A   6      11.111  14.603  14.435  1.00 33.23           C
+ATOM    107  O4' A   A   6      12.152  15.460  13.962  1.00 41.48           O
+ATOM    108  C3' A   A   6      10.417  14.070  13.187  1.00 18.16           C
+ATOM    109  O3' A   A   6       9.007  14.369  13.181  1.00 30.42           O
+ATOM    110  C2' A   A   6      11.240  14.692  12.061  1.00 52.97           C
+ATOM    111  C1' A   A   6      11.699  15.974  12.719  1.00 38.93           C
+ATOM    112  N9  A   A   6      12.918  16.526  12.078  1.00 19.06           N
+ATOM    113  C8  A   A   6      14.115  15.899  11.868  1.00 17.83           C
+ATOM    114  N7  A   A   6      15.049  16.714  11.356  1.00 29.55           N
+ATOM    115  C5  A   A   6      14.416  17.901  11.246  1.00 19.88           C
+ATOM    116  C6  A   A   6      14.873  19.187  10.815  1.00 17.26           C
+ATOM    117  N6  A   A   6      16.161  19.418  10.427  1.00 19.85           N
+ATOM    118  N1  A   A   6      13.999  20.191  10.852  1.00 17.93           N
+ATOM    119  C2  A   A   6      12.753  19.962  11.272  1.00 23.00           C
+ATOM    120  N3  A   A   6      12.210  18.824  11.698  1.00 21.37           N
+ATOM    121  C4  A   A   6      13.116  17.823  11.657  1.00 15.93           C
+ATOM    122  P   T   A   7       8.081  14.050  11.915  1.00 40.72           P
+ATOM    123  OP1 T   A   7       6.668  13.960  12.342  1.00 46.75           O
+ATOM    124  OP2 T   A   7       8.600  12.894  11.137  1.00 42.53           O
+ATOM    125  O5' T   A   7       8.239  15.387  11.076  1.00 35.21           O
+ATOM    126  C5' T   A   7       7.907  16.635  11.686  1.00 34.88           C
+ATOM    127  C4' T   A   7       8.162  17.628  10.598  1.00 31.45           C
+ATOM    128  O4' T   A   7       9.543  17.580  10.279  1.00 46.82           O
+ATOM    129  C3' T   A   7       7.461  17.284   9.296  1.00 23.76           C
+ATOM    130  O3' T   A   7       6.251  18.034   9.162  1.00 44.27           O
+ATOM    131  C2' T   A   7       8.532  17.527   8.223  1.00 26.30           C
+ATOM    132  C1' T   A   7       9.644  18.209   9.019  1.00 28.96           C
+ATOM    133  N1  T   A   7      11.021  17.903   8.565  1.00 20.47           N
+ATOM    134  C2  T   A   7      11.822  18.923   8.176  1.00 28.01           C
+ATOM    135  O2  T   A   7      11.383  20.077   8.143  1.00 40.01           O
+ATOM    136  N3  T   A   7      13.119  18.641   7.852  1.00 27.94           N
+ATOM    137  C4  T   A   7      13.633  17.372   7.882  1.00 15.14           C
+ATOM    138  O4  T   A   7      14.830  17.222   7.619  1.00 32.54           O
+ATOM    139  C5  T   A   7      12.781  16.325   8.235  1.00 10.83           C
+ATOM    140  C7  T   A   7      13.269  14.902   8.236  1.00 36.33           C
+ATOM    141  C6  T   A   7      11.465  16.616   8.594  1.00 12.19           C
+ATOM    142  P   T   A   8       5.384  17.990   7.824  1.00 49.10           P
+ATOM    143  OP1 T   A   8       4.025  18.444   8.180  1.00 41.11           O
+ATOM    144  OP2 T   A   8       5.458  16.668   7.160  1.00 39.21           O
+ATOM    145  O5' T   A   8       6.086  19.118   6.927  1.00 48.80           O
+ATOM    146  C5' T   A   8       6.146  20.478   7.418  1.00 34.73           C
+ATOM    147  C4' T   A   8       6.995  21.229   6.438  1.00 28.73           C
+ATOM    148  O4' T   A   8       8.188  20.458   6.284  1.00 39.07           O
+ATOM    149  C3' T   A   8       6.418  21.332   5.029  1.00 37.88           C
+ATOM    150  O3' T   A   8       5.967  22.667   4.696  1.00 52.04           O
+ATOM    151  C2' T   A   8       7.513  20.718   4.139  1.00 32.80           C
+ATOM    152  C1' T   A   8       8.736  20.855   5.034  1.00 36.58           C
+ATOM    153  N1  T   A   8       9.823  19.876   4.759  1.00 24.57           N
+ATOM    154  C2  T   A   8      11.086  20.316   4.494  1.00 19.41           C
+ATOM    155  O2  T   A   8      11.324  21.516   4.389  1.00 32.74           O
+ATOM    156  N3  T   A   8      12.094  19.403   4.412  1.00 25.12           N
+ATOM    157  C4  T   A   8      11.876  18.060   4.551  1.00 31.35           C
+ATOM    158  O4  T   A   8      12.858  17.317   4.503  1.00 28.53           O
+ATOM    159  C5  T   A   8      10.569  17.611   4.765  1.00 22.80           C
+ATOM    160  C7  T   A   8      10.261  16.140   4.896  1.00 24.98           C
+ATOM    161  C6  T   A   8       9.545  18.548   4.904  1.00 20.28           C
+ATOM    162  P   C   A   9       5.531  23.071   3.209  1.00 48.97           P
+ATOM    163  OP1 C   A   9       4.648  24.244   3.269  1.00 62.33           O
+ATOM    164  OP2 C   A   9       5.010  21.905   2.470  1.00 51.53           O
+ATOM    165  O5' C   A   9       6.926  23.547   2.611  1.00 43.99           O
+ATOM    166  C5' C   A   9       7.636  24.627   3.249  1.00 50.86           C
+ATOM    167  C4' C   A   9       8.897  24.853   2.457  1.00 46.66           C
+ATOM    168  O4' C   A   9       9.638  23.627   2.448  1.00 42.69           O
+ATOM    169  C3' C   A   9       8.717  25.240   0.998  1.00 56.96           C
+ATOM    170  O3' C   A   9       9.470  26.414   0.667  1.00 63.54           O
+ATOM    171  C2' C   A   9       9.126  23.965   0.253  1.00 50.41           C
+ATOM    172  C1' C   A   9      10.241  23.483   1.157  1.00 41.08           C
+ATOM    173  N1  C   A   9      10.524  22.022   1.015  1.00 37.23           N
+ATOM    174  C2  C   A   9      11.814  21.603   0.840  1.00 40.54           C
+ATOM    175  O2  C   A   9      12.691  22.447   0.670  1.00 43.89           O
+ATOM    176  N3  C   A   9      12.106  20.297   0.873  1.00 32.57           N
+ATOM    177  C4  C   A   9      11.141  19.395   1.046  1.00 24.65           C
+ATOM    178  N4  C   A   9      11.461  18.075   1.089  1.00 27.84           N
+ATOM    179  C5  C   A   9       9.803  19.775   1.177  1.00 17.61           C
+ATOM    180  C6  C   A   9       9.499  21.133   1.167  1.00 30.63           C
+ATOM    181  P   G   A  10       9.055  27.333  -0.581  1.00 65.48           P
+ATOM    182  OP1 G   A  10       9.496  28.717  -0.258  1.00 59.09           O
+ATOM    183  OP2 G   A  10       7.632  27.106  -0.947  1.00 45.71           O
+ATOM    184  O5' G   A  10       9.954  26.765  -1.771  1.00 70.30           O
+ATOM    185  C5' G   A  10      11.382  26.940  -1.720  1.00 71.73           C
+ATOM    186  C4' G   A  10      11.972  26.090  -2.802  1.00 58.69           C
+ATOM    187  O4' G   A  10      11.802  24.724  -2.404  1.00 41.03           O
+ATOM    188  C3' G   A  10      11.327  26.178  -4.188  1.00 45.61           C
+ATOM    189  O3' G   A  10      12.311  26.096  -5.214  1.00 52.70           O
+ATOM    190  C2' G   A  10      10.414  24.962  -4.186  1.00 36.02           C
+ATOM    191  C1' G   A  10      11.429  24.028  -3.587  1.00 50.90           C
+ATOM    192  N9  G   A  10      10.890  22.713  -3.200  1.00 45.86           N
+ATOM    193  C8  G   A  10       9.616  22.315  -2.910  1.00 44.49           C
+ATOM    194  N7  G   A  10       9.541  21.009  -2.613  1.00 39.96           N
+ATOM    195  C5  G   A  10      10.818  20.588  -2.718  1.00 38.99           C
+ATOM    196  C6  G   A  10      11.376  19.292  -2.511  1.00 35.78           C
+ATOM    197  O6  G   A  10      10.813  18.252  -2.179  1.00 34.90           O
+ATOM    198  N1  G   A  10      12.729  19.299  -2.720  1.00 23.54           N
+ATOM    199  C2  G   A  10      13.498  20.365  -3.082  1.00  8.73           C
+ATOM    200  N2  G   A  10      14.834  20.169  -3.237  1.00 23.15           N
+ATOM    201  N3  G   A  10      12.982  21.573  -3.267  1.00 24.68           N
+ATOM    202  C4  G   A  10      11.656  21.601  -3.061  1.00 31.53           C
+ATOM    203  P   C   A  11      12.763  27.421  -5.980  1.00 60.62           P
+ATOM    204  OP1 C   A  11      12.796  28.572  -5.049  1.00 63.74           O
+ATOM    205  OP2 C   A  11      11.886  27.542  -7.164  1.00 52.44           O
+ATOM    206  O5' C   A  11      14.272  27.086  -6.366  1.00 57.57           O
+ATOM    207  C5' C   A  11      15.275  27.108  -5.318  1.00 54.70           C
+ATOM    208  C4' C   A  11      16.222  25.946  -5.510  1.00 72.51           C
+ATOM    209  O4' C   A  11      15.443  24.754  -5.397  1.00 47.18           O
+ATOM    210  C3' C   A  11      16.942  25.827  -6.848  1.00 29.82           C
+ATOM    211  O3' C   A  11      18.340  25.511  -6.701  1.00 43.53           O
+ATOM    212  C2' C   A  11      16.118  24.767  -7.578  1.00 51.34           C
+ATOM    213  C1' C   A  11      15.856  23.836  -6.414  1.00 30.07           C
+ATOM    214  N1  C   A  11      14.672  22.975  -6.637  1.00 23.25           N
+ATOM    215  C2  C   A  11      14.802  21.628  -6.529  1.00 20.38           C
+ATOM    216  O2  C   A  11      15.924  21.178  -6.314  1.00 38.77           O
+ATOM    217  N3  C   A  11      13.723  20.842  -6.627  1.00 15.92           N
+ATOM    218  C4  C   A  11      12.515  21.373  -6.836  1.00 15.82           C
+ATOM    219  N4  C   A  11      11.410  20.574  -6.872  1.00 28.04           N
+ATOM    220  C5  C   A  11      12.348  22.744  -6.978  1.00 26.17           C
+ATOM    221  C6  C   A  11      13.470  23.558  -6.869  1.00 35.50           C
+ATOM    222  P   G   A  12      19.331  25.774  -7.925  1.00 55.98           P
+ATOM    223  OP1 G   A  12      20.704  25.976  -7.408  1.00 45.83           O
+ATOM    224  OP2 G   A  12      18.763  26.851  -8.758  1.00 44.26           O
+ATOM    225  O5' G   A  12      19.302  24.412  -8.763  1.00 62.63           O
+ATOM    226  C5' G   A  12      20.109  23.284  -8.359  1.00 69.50           C
+ATOM    227  C4' G   A  12      19.748  22.167  -9.299  1.00 39.92           C
+ATOM    228  O4' G   A  12      18.350  21.969  -9.139  1.00 32.00           O
+ATOM    229  C3' G   A  12      19.921  22.404 -10.815  1.00 50.39           C
+ATOM    230  O3' G   A  12      20.985  21.635 -11.401  1.00 64.13           O
+ATOM    231  C2' G   A  12      18.535  22.062 -11.381  1.00 36.18           C
+ATOM    232  C1' G   A  12      17.965  21.200 -10.269  1.00 24.79           C
+ATOM    233  N9  G   A  12      16.493  21.220 -10.265  1.00 28.44           N
+ATOM    234  C8  G   A  12      15.663  22.289 -10.478  1.00 31.85           C
+ATOM    235  N7  G   A  12      14.368  21.958 -10.390  1.00 38.26           N
+ATOM    236  C5  G   A  12      14.388  20.640 -10.102  1.00 28.99           C
+ATOM    237  C6  G   A  12      13.301  19.742  -9.856  1.00 42.63           C
+ATOM    238  O6  G   A  12      12.091  19.967  -9.857  1.00 49.17           O
+ATOM    239  N1  G   A  12      13.750  18.466  -9.625  1.00 40.15           N
+ATOM    240  C2  G   A  12      15.042  18.043  -9.605  1.00 33.42           C
+ATOM    241  N2  G   A  12      15.259  16.717  -9.406  1.00 40.53           N
+ATOM    242  N3  G   A  12      16.061  18.885  -9.792  1.00 37.34           N
+ATOM    243  C4  G   A  12      15.660  20.156 -10.027  1.00 31.14           C
+ATOM    244  O5' DC  B  13       7.458  11.884  -9.070  1.00 66.23           O
+ATOM    245  C5' DC  B  13       8.252  10.968  -9.854  1.00 71.49           C
+ATOM    246  C4' DC  B  13       9.714  11.141  -9.512  1.00 56.82           C
+ATOM    247  O4' DC  B  13      10.144  12.455  -9.908  1.00 57.92           O
+ATOM    248  C3' DC  B  13      10.103  10.989  -8.055  1.00 34.34           C
+ATOM    249  O3' DC  B  13      11.293  10.221  -7.904  1.00 42.11           O
+ATOM    250  C2' DC  B  13      10.254  12.437  -7.607  1.00 29.08           C
+ATOM    251  C1' DC  B  13      10.896  13.044  -8.837  1.00 38.40           C
+ATOM    252  N1  DC  B  13      10.575  14.487  -8.944  1.00 34.33           N
+ATOM    253  C2  DC  B  13      11.559  15.430  -9.006  1.00 22.98           C
+ATOM    254  O2  DC  B  13      12.725  15.066  -8.932  1.00 50.83           O
+ATOM    255  N3  DC  B  13      11.246  16.714  -9.193  1.00 37.14           N
+ATOM    256  C4  DC  B  13       9.980  17.088  -9.334  1.00 42.60           C
+ATOM    257  N4  DC  B  13       9.698  18.395  -9.589  1.00 54.91           N
+ATOM    258  C5  DC  B  13       8.939  16.162  -9.274  1.00 56.67           C
+ATOM    259  C6  DC  B  13       9.265  14.824  -9.080  1.00 49.21           C
+ATOM    260  P   DG  B  14      11.602   9.510  -6.502  1.00 60.42           P
+ATOM    261  OP1 DG  B  14      11.666   8.032  -6.664  1.00 57.44           O
+ATOM    262  OP2 DG  B  14      10.644  10.010  -5.494  1.00 46.07           O
+ATOM    263  O5' DG  B  14      13.051  10.094  -6.177  1.00 50.94           O
+ATOM    264  C5' DG  B  14      14.100  10.021  -7.156  1.00 34.84           C
+ATOM    265  C4' DG  B  14      15.113  10.992  -6.657  1.00 48.06           C
+ATOM    266  O4' DG  B  14      14.556  12.300  -6.755  1.00 37.01           O
+ATOM    267  C3' DG  B  14      15.445  10.806  -5.189  1.00 50.58           C
+ATOM    268  O3' DG  B  14      16.836  10.560  -5.013  1.00 51.98           O
+ATOM    269  C2' DG  B  14      14.937  12.100  -4.529  1.00 40.32           C
+ATOM    270  C1' DG  B  14      15.058  13.086  -5.671  1.00 46.69           C
+ATOM    271  N9  DG  B  14      14.036  14.140  -5.536  1.00 29.17           N
+ATOM    272  C8  DG  B  14      12.710  13.957  -5.259  1.00 23.48           C
+ATOM    273  N7  DG  B  14      12.016  15.103  -5.269  1.00 37.54           N
+ATOM    274  C5  DG  B  14      12.937  16.041  -5.558  1.00 26.27           C
+ATOM    275  C6  DG  B  14      12.761  17.451  -5.710  1.00 40.82           C
+ATOM    276  O6  DG  B  14      11.723  18.111  -5.630  1.00 44.39           O
+ATOM    277  N1  DG  B  14      13.952  18.079  -5.973  1.00 19.52           N
+ATOM    278  C2  DG  B  14      15.171  17.485  -6.107  1.00 18.48           C
+ATOM    279  N2  DG  B  14      16.244  18.292  -6.325  1.00 36.58           N
+ATOM    280  N3  DG  B  14      15.329  16.161  -5.986  1.00 46.96           N
+ATOM    281  C4  DG  B  14      14.179  15.499  -5.721  1.00 35.70           C
+ATOM    282  P   DC  B  15      17.478  10.380  -3.569  1.00 46.26           P
+ATOM    283  OP1 DC  B  15      18.665   9.516  -3.729  1.00 46.07           O
+ATOM    284  OP2 DC  B  15      16.427   9.940  -2.633  1.00 40.43           O
+ATOM    285  O5' DC  B  15      17.957  11.865  -3.208  1.00 40.97           O
+ATOM    286  C5' DC  B  15      18.963  12.531  -3.996  1.00 28.78           C
+ATOM    287  C4' DC  B  15      18.936  13.958  -3.536  1.00 32.84           C
+ATOM    288  O4' DC  B  15      17.592  14.409  -3.622  1.00 37.24           O
+ATOM    289  C3' DC  B  15      19.253  14.139  -2.066  1.00 43.98           C
+ATOM    290  O3' DC  B  15      20.659  14.219  -1.858  1.00 40.90           O
+ATOM    291  C2' DC  B  15      18.520  15.417  -1.728  1.00 36.26           C
+ATOM    292  C1' DC  B  15      17.545  15.602  -2.872  1.00 20.54           C
+ATOM    293  N1  DC  B  15      16.145  15.696  -2.428  1.00 23.10           N
+ATOM    294  C2  DC  B  15      15.507  16.886  -2.558  1.00 32.12           C
+ATOM    295  O2  DC  B  15      16.162  17.846  -2.957  1.00 30.04           O
+ATOM    296  N3  DC  B  15      14.209  16.983  -2.264  1.00 32.94           N
+ATOM    297  C4  DC  B  15      13.536  15.919  -1.825  1.00 16.43           C
+ATOM    298  N4  DC  B  15      12.205  16.017  -1.553  1.00 34.91           N
+ATOM    299  C5  DC  B  15      14.164  14.689  -1.652  1.00 22.75           C
+ATOM    300  C6  DC  B  15      15.509  14.584  -1.979  1.00 26.42           C
+ATOM    301  P   DG  B  16      21.304  14.529  -0.436  1.00 42.39           P
+ATOM    302  OP1 DG  B  16      22.696  14.087  -0.524  1.00 60.41           O
+ATOM    303  OP2 DG  B  16      20.488  13.954   0.650  1.00 51.09           O
+ATOM    304  O5' DG  B  16      21.306  16.117  -0.363  1.00 45.08           O
+ATOM    305  C5' DG  B  16      22.177  16.876  -1.212  1.00 33.20           C
+ATOM    306  C4' DG  B  16      21.739  18.292  -1.021  1.00 24.95           C
+ATOM    307  O4' DG  B  16      20.305  18.225  -1.048  1.00 32.83           O
+ATOM    308  C3' DG  B  16      22.101  18.959   0.293  1.00 41.12           C
+ATOM    309  O3' DG  B  16      22.592  20.293   0.097  1.00 53.45           O
+ATOM    310  C2' DG  B  16      20.820  18.829   1.121  1.00 28.93           C
+ATOM    311  C1' DG  B  16      19.765  18.985   0.046  1.00 37.44           C
+ATOM    312  N9  DG  B  16      18.513  18.299   0.468  1.00 17.75           N
+ATOM    313  C8  DG  B  16      18.363  17.062   1.039  1.00 17.96           C
+ATOM    314  N7  DG  B  16      17.080  16.744   1.281  1.00 24.14           N
+ATOM    315  C5  DG  B  16      16.400  17.832   0.868  1.00  9.96           C
+ATOM    316  C6  DG  B  16      14.996  18.090   0.882  1.00 18.10           C
+ATOM    317  O6  DG  B  16      14.082  17.378   1.280  1.00 31.13           O
+ATOM    318  N1  DG  B  16      14.712  19.349   0.418  1.00 17.72           N
+ATOM    319  C2  DG  B  16      15.606  20.268  -0.027  1.00 16.23           C
+ATOM    320  N2  DG  B  16      15.134  21.493  -0.382  1.00 33.42           N
+ATOM    321  N3  DG  B  16      16.912  20.017  -0.072  1.00 26.37           N
+ATOM    322  C4  DG  B  16      17.236  18.794   0.384  1.00 31.72           C
+ATOM    323  P   DA  B  17      22.904  21.238   1.339  1.00 46.87           P
+ATOM    324  OP1 DA  B  17      23.994  22.183   1.025  1.00 47.75           O
+ATOM    325  OP2 DA  B  17      23.104  20.390   2.538  1.00 46.81           O
+ATOM    326  O5' DA  B  17      21.577  22.107   1.390  1.00 39.51           O
+ATOM    327  C5' DA  B  17      21.216  22.833   0.200  1.00 30.37           C
+ATOM    328  C4' DA  B  17      20.101  23.788   0.484  1.00 35.43           C
+ATOM    329  O4' DA  B  17      18.913  23.054   0.816  1.00 43.05           O
+ATOM    330  C3' DA  B  17      20.347  24.743   1.633  1.00 44.50           C
+ATOM    331  O3' DA  B  17      19.732  26.010   1.411  1.00 78.59           O
+ATOM    332  C2' DA  B  17      19.752  23.945   2.791  1.00 44.42           C
+ATOM    333  C1' DA  B  17      18.497  23.393   2.145  1.00 42.55           C
+ATOM    334  N9  DA  B  17      18.079  22.095   2.758  1.00 34.56           N
+ATOM    335  C8  DA  B  17      18.847  21.020   3.133  1.00 20.07           C
+ATOM    336  N7  DA  B  17      18.114  19.984   3.584  1.00 27.60           N
+ATOM    337  C5  DA  B  17      16.842  20.424   3.488  1.00 18.80           C
+ATOM    338  C6  DA  B  17      15.577  19.817   3.786  1.00 32.58           C
+ATOM    339  N6  DA  B  17      15.448  18.537   4.242  1.00 29.54           N
+ATOM    340  N1  DA  B  17      14.482  20.557   3.593  1.00 35.01           N
+ATOM    341  C2  DA  B  17      14.597  21.801   3.118  1.00 36.47           C
+ATOM    342  N3  DA  B  17      15.700  22.472   2.783  1.00 38.96           N
+ATOM    343  C4  DA  B  17      16.791  21.706   3.002  1.00 28.24           C
+ATOM    344  P   DA  B  18      19.803  27.141   2.526  1.00 46.11           P
+ATOM    345  OP1 DA  B  18      19.796  28.478   1.888  1.00 49.20           O
+ATOM    346  OP2 DA  B  18      20.953  26.858   3.426  1.00 43.48           O
+ATOM    347  O5' DA  B  18      18.396  26.939   3.241  1.00 40.83           O
+ATOM    348  C5' DA  B  18      17.203  27.028   2.452  1.00 40.72           C
+ATOM    349  C4' DA  B  18      16.035  26.958   3.388  1.00 66.52           C
+ATOM    350  O4' DA  B  18      15.856  25.612   3.850  1.00 44.25           O
+ATOM    351  C3' DA  B  18      16.101  27.861   4.615  1.00 63.34           C
+ATOM    352  O3' DA  B  18      14.890  28.608   4.757  1.00 55.65           O
+ATOM    353  C2' DA  B  18      16.368  26.844   5.724  1.00 34.49           C
+ATOM    354  C1' DA  B  18      15.561  25.655   5.243  1.00 29.45           C
+ATOM    355  N9  DA  B  18      16.104  24.373   5.755  1.00 20.03           N
+ATOM    356  C8  DA  B  18      17.411  23.967   5.830  1.00 16.51           C
+ATOM    357  N7  DA  B  18      17.539  22.706   6.276  1.00 20.58           N
+ATOM    358  C5  DA  B  18      16.266  22.309   6.480  1.00 21.66           C
+ATOM    359  C6  DA  B  18      15.715  21.073   6.933  1.00 17.93           C
+ATOM    360  N6  DA  B  18      16.483  19.994   7.243  1.00 20.37           N
+ATOM    361  N1  DA  B  18      14.389  20.994   7.036  1.00 20.81           N
+ATOM    362  C2  DA  B  18      13.636  22.041   6.708  1.00 26.77           C
+ATOM    363  N3  DA  B  18      14.019  23.234   6.265  1.00 26.83           N
+ATOM    364  C4  DA  B  18      15.367  23.291   6.174  1.00 27.48           C
+ATOM    365  P   DT  B  19      14.604  29.545   6.020  1.00 48.40           P
+ATOM    366  OP1 DT  B  19      13.792  30.696   5.582  1.00 50.18           O
+ATOM    367  OP2 DT  B  19      15.852  29.836   6.749  1.00 44.42           O
+ATOM    368  O5' DT  B  19      13.633  28.628   6.885  1.00 53.86           O
+ATOM    369  C5' DT  B  19      12.398  28.171   6.303  1.00 55.04           C
+ATOM    370  C4' DT  B  19      11.809  27.217   7.302  1.00 44.86           C
+ATOM    371  O4' DT  B  19      12.767  26.184   7.534  1.00 48.52           O
+ATOM    372  C3' DT  B  19      11.515  27.822   8.669  1.00 41.77           C
+ATOM    373  O3' DT  B  19      10.103  27.952   8.891  1.00 57.02           O
+ATOM    374  C2' DT  B  19      12.267  26.906   9.630  1.00 39.28           C
+ATOM    375  C1' DT  B  19      12.426  25.645   8.799  1.00 27.68           C
+ATOM    376  N1  DT  B  19      13.609  24.850   9.205  1.00 21.67           N
+ATOM    377  C2  DT  B  19      13.442  23.575   9.656  1.00 31.71           C
+ATOM    378  O2  DT  B  19      12.311  23.101   9.802  1.00 36.00           O
+ATOM    379  N3  DT  B  19      14.551  22.825   9.913  1.00 24.66           N
+ATOM    380  C4  DT  B  19      15.815  23.321   9.777  1.00 40.64           C
+ATOM    381  O4  DT  B  19      16.755  22.570  10.029  1.00 31.47           O
+ATOM    382  C5  DT  B  19      15.972  24.647   9.362  1.00 31.79           C
+ATOM    383  C7  DT  B  19      17.345  25.239   9.234  1.00 30.05           C
+ATOM    384  C6  DT  B  19      14.844  25.405   9.048  1.00 14.35           C
+ATOM    385  P   DT  B  20       9.513  28.533  10.260  1.00 48.24           P
+ATOM    386  OP1 DT  B  20       8.145  29.007   9.998  1.00 41.28           O
+ATOM    387  OP2 DT  B  20      10.455  29.513  10.841  1.00 53.39           O
+ATOM    388  O5' DT  B  20       9.395  27.223  11.153  1.00 36.57           O
+ATOM    389  C5' DT  B  20       8.576  26.148  10.664  1.00 50.41           C
+ATOM    390  C4' DT  B  20       8.655  25.060  11.678  1.00 32.08           C
+ATOM    391  O4' DT  B  20      10.003  24.615  11.764  1.00 48.38           O
+ATOM    392  C3' DT  B  20       8.272  25.471  13.087  1.00 29.99           C
+ATOM    393  O3' DT  B  20       7.199  24.657  13.553  1.00 45.14           O
+ATOM    394  C2' DT  B  20       9.586  25.307  13.860  1.00 32.42           C
+ATOM    395  C1' DT  B  20      10.190  24.148  13.089  1.00 39.56           C
+ATOM    396  N1  DT  B  20      11.660  24.070  13.205  1.00 20.36           N
+ATOM    397  C2  DT  B  20      12.257  22.880  13.486  1.00 27.55           C
+ATOM    398  O2  DT  B  20      11.583  21.866  13.691  1.00 38.33           O
+ATOM    399  N3  DT  B  20      13.620  22.829  13.497  1.00 29.60           N
+ATOM    400  C4  DT  B  20      14.402  23.914  13.225  1.00 30.11           C
+ATOM    401  O4  DT  B  20      15.625  23.764  13.252  1.00 32.92           O
+ATOM    402  C5  DT  B  20      13.774  25.126  12.933  1.00 24.11           C
+ATOM    403  C7  DT  B  20      14.563  26.358  12.612  1.00 23.96           C
+ATOM    404  C6  DT  B  20      12.385  25.187  12.926  1.00 19.78           C
+ATOM    405  P   DC  B  21       6.594  24.823  15.016  1.00 54.73           P
+ATOM    406  OP1 DC  B  21       5.169  24.424  14.987  1.00 53.98           O
+ATOM    407  OP2 DC  B  21       6.870  26.189  15.511  1.00 65.53           O
+ATOM    408  O5' DC  B  21       7.409  23.731  15.839  1.00 50.67           O
+ATOM    409  C5' DC  B  21       7.331  22.352  15.433  1.00 60.86           C
+ATOM    410  C4' DC  B  21       8.100  21.598  16.461  1.00 40.86           C
+ATOM    411  O4' DC  B  21       9.478  21.902  16.263  1.00 36.88           O
+ATOM    412  C3' DC  B  21       7.766  22.045  17.879  1.00 53.80           C
+ATOM    413  O3' DC  B  21       7.036  21.041  18.611  1.00 79.04           O
+ATOM    414  C2' DC  B  21       9.123  22.414  18.469  1.00 48.43           C
+ATOM    415  C1' DC  B  21      10.107  21.743  17.523  1.00 36.51           C
+ATOM    416  N1  DC  B  21      11.328  22.556  17.331  1.00 24.72           N
+ATOM    417  C2  DC  B  21      12.534  21.939  17.329  1.00 30.96           C
+ATOM    418  O2  DC  B  21      12.560  20.731  17.579  1.00 34.53           O
+ATOM    419  N3  DC  B  21      13.639  22.639  17.035  1.00 31.69           N
+ATOM    420  C4  DC  B  21      13.560  23.938  16.739  1.00 21.53           C
+ATOM    421  N4  DC  B  21      14.685  24.628  16.404  1.00 23.72           N
+ATOM    422  C5  DC  B  21      12.338  24.609  16.736  1.00 30.74           C
+ATOM    423  C6  DC  B  21      11.193  23.878  17.035  1.00 27.58           C
+ATOM    424  P   DG  B  22       6.509  21.324  20.099  1.00 56.50           P
+ATOM    425  OP1 DG  B  22       5.387  20.397  20.396  1.00 50.81           O
+ATOM    426  OP2 DG  B  22       6.235  22.774  20.306  1.00 53.84           O
+ATOM    427  O5' DG  B  22       7.767  20.924  20.993  1.00 66.30           O
+ATOM    428  C5' DG  B  22       8.216  19.559  21.073  1.00 73.42           C
+ATOM    429  C4' DG  B  22       9.422  19.557  21.977  1.00 42.96           C
+ATOM    430  O4' DG  B  22      10.493  20.260  21.319  1.00 52.87           O
+ATOM    431  C3' DG  B  22       9.267  20.267  23.325  1.00 38.51           C
+ATOM    432  O3' DG  B  22      10.088  19.657  24.293  1.00 60.28           O
+ATOM    433  C2' DG  B  22       9.751  21.670  22.990  1.00 22.00           C
+ATOM    434  C1' DG  B  22      10.988  21.226  22.256  1.00 24.85           C
+ATOM    435  N9  DG  B  22      11.599  22.357  21.543  1.00 25.91           N
+ATOM    436  C8  DG  B  22      11.037  23.545  21.159  1.00 23.91           C
+ATOM    437  N7  DG  B  22      11.921  24.362  20.566  1.00 39.18           N
+ATOM    438  C5  DG  B  22      13.072  23.653  20.580  1.00 25.66           C
+ATOM    439  C6  DG  B  22      14.370  24.003  20.102  1.00 28.34           C
+ATOM    440  O6  DG  B  22      14.747  25.057  19.585  1.00 31.85           O
+ATOM    441  N1  DG  B  22      15.268  22.983  20.308  1.00 25.22           N
+ATOM    442  C2  DG  B  22      15.023  21.776  20.891  1.00 11.07           C
+ATOM    443  N2  DG  B  22      16.066  20.914  21.038  1.00 25.92           N
+ATOM    444  N3  DG  B  22      13.815  21.452  21.350  1.00 19.05           N
+ATOM    445  C4  DG  B  22      12.902  22.429  21.151  1.00 23.69           C
+ATOM    446  P   DC  B  23       9.477  18.627  25.340  1.00 55.93           P
+ATOM    447  OP1 DC  B  23       8.767  17.534  24.627  1.00 45.14           O
+ATOM    448  OP2 DC  B  23       8.670  19.409  26.312  1.00 41.61           O
+ATOM    449  O5' DC  B  23      10.807  18.067  26.034  1.00 59.70           O
+ATOM    450  C5' DC  B  23      11.688  17.170  25.310  1.00 63.13           C
+ATOM    451  C4' DC  B  23      13.115  17.573  25.593  1.00 27.86           C
+ATOM    452  O4' DC  B  23      13.284  18.804  24.893  1.00 50.51           O
+ATOM    453  C3' DC  B  23      13.441  17.879  27.059  1.00 46.45           C
+ATOM    454  O3' DC  B  23      14.341  16.938  27.677  1.00 57.21           O
+ATOM    455  C2' DC  B  23      13.928  19.322  27.025  1.00 68.01           C
+ATOM    456  C1' DC  B  23      14.312  19.508  25.568  1.00 32.05           C
+ATOM    457  N1  DC  B  23      14.144  20.932  25.170  1.00 23.28           N
+ATOM    458  C2  DC  B  23      15.199  21.595  24.630  1.00 20.62           C
+ATOM    459  O2  DC  B  23      16.257  20.984  24.504  1.00 29.62           O
+ATOM    460  N3  DC  B  23      15.067  22.877  24.257  1.00 39.00           N
+ATOM    461  C4  DC  B  23      13.898  23.510  24.404  1.00 30.44           C
+ATOM    462  N4  DC  B  23      13.771  24.813  24.018  1.00 34.66           N
+ATOM    463  C5  DC  B  23      12.795  22.866  24.967  1.00 27.74           C
+ATOM    464  C6  DC  B  23      12.935  21.540  25.359  1.00 24.58           C
+ATOM    465  P   DG  B  24      14.658  17.064  29.247  1.00 53.70           P
+ATOM    466  OP1 DG  B  24      14.863  15.717  29.825  1.00 61.79           O
+ATOM    467  OP2 DG  B  24      13.633  17.912  29.920  1.00 36.06           O
+ATOM    468  O5' DG  B  24      16.033  17.880  29.284  1.00 34.06           O
+ATOM    469  C5' DG  B  24      17.243  17.320  28.742  1.00 46.57           C
+ATOM    470  C4' DG  B  24      18.208  18.464  28.758  1.00 50.89           C
+ATOM    471  O4' DG  B  24      17.716  19.428  27.829  1.00 32.02           O
+ATOM    472  C3' DG  B  24      18.230  19.236  30.058  1.00 30.38           C
+ATOM    473  O3' DG  B  24      18.978  18.583  31.084  1.00 61.06           O
+ATOM    474  C2' DG  B  24      18.885  20.519  29.578  1.00 53.33           C
+ATOM    475  C1' DG  B  24      18.276  20.693  28.188  1.00 35.03           C
+ATOM    476  N9  DG  B  24      17.164  21.659  28.139  1.00 30.25           N
+ATOM    477  C8  DG  B  24      15.874  21.536  28.580  1.00 30.86           C
+ATOM    478  N7  DG  B  24      15.129  22.614  28.308  1.00 44.08           N
+ATOM    479  C5  DG  B  24      15.990  23.436  27.673  1.00 16.87           C
+ATOM    480  C6  DG  B  24      15.765  24.729  27.117  1.00 19.36           C
+ATOM    481  O6  DG  B  24      14.719  25.373  27.067  1.00 33.30           O
+ATOM    482  N1  DG  B  24      16.926  25.257  26.604  1.00 15.78           N
+ATOM    483  C2  DG  B  24      18.157  24.666  26.579  1.00 11.92           C
+ATOM    484  N2  DG  B  24      19.208  25.386  26.096  1.00 29.76           N
+ATOM    485  N3  DG  B  24      18.350  23.438  27.053  1.00 21.95           N
+ATOM    486  C4  DG  B  24      17.231  22.893  27.570  1.00 13.89           C
+END
diff --git a/regtest/basic/rt66dna/COLVAR.reference b/regtest/basic/rt66dna/COLVAR.reference
new file mode 100644
index 0000000000000000000000000000000000000000..0904bcef9d8a59f260ae7cf307a8d92f61526256
--- /dev/null
+++ b/regtest/basic/rt66dna/COLVAR.reference
@@ -0,0 +1,56 @@
+#! FIELDS time t2 t3 t4 t5 t5b t5c t5d t6 t7 t8 t9 t10 t12 d1 d2 puck1.phs puck1.amp puck1.Zx puck1.Zy puck2.phs puck2.amp puck2.Zx puck2.Zy puck3.phs puck3.amp puck3.Zx puck3.Zy puck4.phs puck4.amp puck4.Zx puck4.Zy puck5.phs puck5.amp puck5.Zx puck5.Zy puck6.phs puck6.amp puck6.Zx puck6.Zy puck7.phs puck7.amp puck7.Zx puck7.Zy puck8.phs puck8.amp puck8.Zx puck8.Zy puck9.phs puck9.amp puck9.Zx puck9.Zy puck10.phs puck10.amp puck10.Zx puck10.Zy puck11.phs puck11.amp puck11.Zx puck11.Zy puck12.phs puck12.amp puck12.Zx puck12.Zy puck13.phs puck13.amp puck13.Zx puck13.Zy puck14.phs puck14.amp puck14.Zx puck14.Zy
+#! SET min_t2 -pi
+#! SET max_t2 pi
+#! SET min_t3 -pi
+#! SET max_t3 pi
+#! SET min_t4 -pi
+#! SET max_t4 pi
+#! SET min_t5 -pi
+#! SET max_t5 pi
+#! SET min_t5b -pi
+#! SET max_t5b pi
+#! SET min_t5c -pi
+#! SET max_t5c pi
+#! SET min_t5d -pi
+#! SET max_t5d pi
+#! SET min_t6 -pi
+#! SET max_t6 pi
+#! SET min_t7 -pi
+#! SET max_t7 pi
+#! SET min_t8 -pi
+#! SET max_t8 pi
+#! SET min_t9 -pi
+#! SET max_t9 pi
+#! SET min_t10 -pi
+#! SET max_t10 pi
+#! SET min_t12 -pi
+#! SET max_t12 pi
+#! SET min_puck1.phs -pi
+#! SET max_puck1.phs pi
+#! SET min_puck2.phs -pi
+#! SET max_puck2.phs pi
+#! SET min_puck3.phs -pi
+#! SET max_puck3.phs pi
+#! SET min_puck4.phs -pi
+#! SET max_puck4.phs pi
+#! SET min_puck5.phs -pi
+#! SET max_puck5.phs pi
+#! SET min_puck6.phs -pi
+#! SET max_puck6.phs pi
+#! SET min_puck7.phs -pi
+#! SET max_puck7.phs pi
+#! SET min_puck8.phs -pi
+#! SET max_puck8.phs pi
+#! SET min_puck9.phs -pi
+#! SET max_puck9.phs pi
+#! SET min_puck10.phs -pi
+#! SET max_puck10.phs pi
+#! SET min_puck11.phs -pi
+#! SET max_puck11.phs pi
+#! SET min_puck12.phs -pi
+#! SET max_puck12.phs pi
+#! SET min_puck13.phs -pi
+#! SET max_puck13.phs pi
+#! SET min_puck14.phs -pi
+#! SET max_puck14.phs pi
+ 0.000000 -1.1453  2.9964  1.0070 -2.2072 -2.1303 -1.9392 -1.6274  3.0344 -1.4983 -0.8659  0.7964 -0.7730  0.6787  0.3481  1.3938  2.8252  0.9996 -0.9500  0.3110  2.4585  0.7365 -0.5713  0.4649  1.6120  0.6506 -0.0268  0.6500  2.9310  0.8815 -0.8621  0.1843  2.2636  0.7972 -0.5091  0.6134  2.2463  0.8562 -0.5353  0.6682  1.7725  0.8010 -0.1604  0.7848  2.0460  0.8278 -0.3787  0.7361  2.4851  0.7967 -0.6311  0.4863  2.5826  0.9594 -0.8134  0.5088  2.6013  0.8293 -0.7111  0.4266  2.0177  0.8832 -0.3817  0.7965  2.6977  0.7686 -0.6941  0.3300  2.2730  0.7589 -0.4901  0.5794
diff --git a/regtest/basic/rt66dna/Makefile b/regtest/basic/rt66dna/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3703b27cea227aa053fb6d1d73f861e4384dbcee
--- /dev/null
+++ b/regtest/basic/rt66dna/Makefile
@@ -0,0 +1 @@
+include ../../scripts/test.make
diff --git a/regtest/basic/rt66dna/config b/regtest/basic/rt66dna/config
new file mode 100644
index 0000000000000000000000000000000000000000..bc157ca2e5336423a095a9a79efc683a6f29fb75
--- /dev/null
+++ b/regtest/basic/rt66dna/config
@@ -0,0 +1,3 @@
+plumed_needs="cregex"
+type=driver
+arg="--igro 1bna.gro"
diff --git a/regtest/basic/rt66dna/plumed.dat b/regtest/basic/rt66dna/plumed.dat
new file mode 100644
index 0000000000000000000000000000000000000000..8570d62a6b2a5edb90ef726d406e24901fe8dbd7
--- /dev/null
+++ b/regtest/basic/rt66dna/plumed.dat
@@ -0,0 +1,42 @@
+MOLINFO STRUCTURE=1bna.pdb MOLTYPE=dna
+DUMPATOMS FILE=o.gro ATOMS=1-486
+
+t2: TORSION ATOMS=@alpha-2
+t3: TORSION ATOMS=@beta-3
+t4: TORSION ATOMS=@gamma-4
+t5: TORSION ATOMS=@chi-5
+t5b: TORSION ATOMS=@chi-6
+t5c: TORSION ATOMS=@chi-2
+t5d: TORSION ATOMS=@chi-4
+t6: TORSION ATOMS=@epsilon-6
+t7: TORSION ATOMS=@zeta-7
+t8: TORSION ATOMS=@v0-8
+t9: TORSION ATOMS=@v1-9
+t10: TORSION ATOMS=@v2-10
+t11: TORSION ATOMS=@v3-11
+t12: TORSION ATOMS=@v4-12
+
+c1: CENTER ATOMS=@base-4
+c2: CENTER ATOMS=@base-5
+d1: DISTANCE ATOMS=c1,c2
+c3: CENTER ATOMS=@base-2
+c4: CENTER ATOMS=@base-6
+d2: DISTANCE ATOMS=c3,c4
+
+puck1: PUCKERING ATOMS=@sugar-1
+puck2: PUCKERING ATOMS=@sugar-2
+puck3: PUCKERING ATOMS=@sugar-3
+puck4: PUCKERING ATOMS=@sugar-4
+puck5: PUCKERING ATOMS=@sugar-5
+puck6: PUCKERING ATOMS=@sugar-6
+puck7: PUCKERING ATOMS=@sugar-7
+puck8: PUCKERING ATOMS=@sugar-8
+puck9: PUCKERING ATOMS=@sugar-9
+puck10: PUCKERING ATOMS=@sugar-10
+puck11: PUCKERING ATOMS=@sugar-11
+puck12: PUCKERING ATOMS=@sugar-12
+puck13: PUCKERING ATOMS=@sugar-13
+puck14: PUCKERING ATOMS=@sugar-14
+
+
+PRINT ARG=t2,t3,t4,t5,t5b,t5c,t5d,t6,t7,t8,t9,t10,t12,d1,d2,(puck.*) FILE=COLVAR FMT=%7.4f