diff --git a/regtest/multicolvar/rt25/derivatives.reference b/regtest/multicolvar/rt25/derivatives.reference
index 10e58b83c011b08740ae51bf94def9247b5c04fc..d0cb13b2f5ad38a82bde4fdfa1bc20696a776816 100644
--- a/regtest/multicolvar/rt25/derivatives.reference
+++ b/regtest/multicolvar/rt25/derivatives.reference
@@ -1,526 +1,526 @@
-#! FIELDS time parameter c1 c1num
- 0.000000 0  -0.0023  -0.0023
- 0.000000 1   0.0023   0.0023
- 0.000000 2   0.0008   0.0008
- 0.000000 3  -0.0027  -0.0027
- 0.000000 4  -0.0030  -0.0030
- 0.000000 5  -0.0010  -0.0010
- 0.000000 6   0.0126   0.0126
- 0.000000 7   0.0021   0.0021
- 0.000000 8   0.0006   0.0006
- 0.000000 9  -0.0076  -0.0076
- 0.000000 10  -0.0014  -0.0014
- 0.000000 11  -0.0004  -0.0004
- 0.000000 12  -0.1068  -0.1068
- 0.000000 13  -0.0978  -0.0978
- 0.000000 14   0.0943   0.0943
- 0.000000 15   0.0592   0.0592
- 0.000000 16  -0.0011  -0.0011
- 0.000000 17  -0.0556  -0.0556
- 0.000000 18   0.0234   0.0234
- 0.000000 19   0.1834   0.1834
- 0.000000 20  -0.0108  -0.0108
- 0.000000 21   0.0243   0.0243
- 0.000000 22  -0.0845  -0.0845
- 0.000000 23  -0.0279  -0.0279
- 0.000000 24   0.0377   0.0377
- 0.000000 25  -0.1134  -0.1134
- 0.000000 26  -0.0379  -0.0379
- 0.000000 27   0.0123   0.0123
- 0.000000 28   0.0956   0.0956
- 0.000000 29  -0.0118  -0.0118
- 0.000000 30   0.0879   0.0879
- 0.000000 31  -0.1220  -0.1220
- 0.000000 32  -0.0879  -0.0879
- 0.000000 33  -0.1379  -0.1379
- 0.000000 34   0.1399   0.1399
- 0.000000 35   0.1376   0.1376
- 0.000000 36  -0.1868  -0.1868
- 0.000000 37   0.1816   0.1816
- 0.000000 38   0.2145   0.2145
- 0.000000 39  -0.0037  -0.0037
- 0.000000 40   0.0112   0.0112
- 0.000000 41  -0.1880  -0.1880
- 0.000000 42  -0.0093  -0.0093
- 0.000000 43   0.0195   0.0195
- 0.000000 44  -0.2515  -0.2515
- 0.000000 45   0.1999   0.1999
- 0.000000 46  -0.2123  -0.2123
- 0.000000 47   0.2250   0.2250
- 0.000000 48   0.0481   0.0481
- 0.000000 49  -0.1259  -0.1259
- 0.000000 50   0.0384   0.0384
- 0.000000 51  -0.1440  -0.1440
- 0.000000 52   0.2683   0.2683
- 0.000000 53  -0.1172  -0.1172
- 0.000000 54  -0.0504  -0.0504
- 0.000000 55   0.0087   0.0087
- 0.000000 56  -0.0429  -0.0429
- 0.000000 57   0.1463   0.1463
- 0.000000 58  -0.1512  -0.1512
- 0.000000 59   0.1218   0.1218
- 0.000000 60  -0.0873  -0.0873
- 0.000000 61  -0.0686  -0.0686
- 0.000000 62   0.2131   0.2131
- 0.000000 63   0.0814   0.0814
- 0.000000 64   0.0863   0.0863
- 0.000000 65  -0.2416  -0.2416
- 0.000000 66  -0.1096  -0.1096
- 0.000000 67   0.0507   0.0507
- 0.000000 68   0.0043   0.0043
- 0.000000 69   0.1156   0.1156
- 0.000000 70  -0.0684  -0.0684
- 0.000000 71   0.0242   0.0242
- 0.000000 72  -0.9759  -0.9759
- 0.000000 73  -0.0191  -0.0191
- 0.000000 74   0.0303   0.0303
- 0.000000 75   1.3232   1.3232
- 0.000000 76   0.0240   0.0240
- 0.000000 77  -0.0463  -0.0463
- 0.000000 78  -0.6202  -0.6202
- 0.000000 79  -0.0184  -0.0184
- 0.000000 80   0.0024   0.0024
- 0.000000 81   0.2729   0.2729
- 0.000000 82   0.0135   0.0135
- 0.000000 83   0.0136   0.0136
- 0.000000 84  -0.2793  -0.2793
- 0.000000 85  -0.2587  -0.2587
- 0.000000 86   0.1898   0.1898
- 0.000000 87   0.4427   0.4427
- 0.000000 88   0.3809   0.3809
- 0.000000 89  -0.2772  -0.2772
- 0.000000 90  -0.3711  -0.3711
- 0.000000 91  -0.1266  -0.1266
- 0.000000 92   0.0760   0.0760
- 0.000000 93   0.2077   0.2077
- 0.000000 94   0.0044   0.0044
- 0.000000 95   0.0114   0.0114
- 0.000000 96   0.6933   0.6933
- 0.000000 97  -0.0140  -0.0140
- 0.000000 98  -0.4462  -0.4462
- 0.000000 99  -0.0140  -0.0140
- 0.000000 100  -0.1875  -0.1875
- 0.000000 101   0.1721   0.1721
- 0.000000 102  -0.4462  -0.4462
- 0.000000 103   0.1721   0.1721
- 0.000000 104  -0.5058  -0.5058
- 0.005000 0  -0.0357  -0.0357
- 0.005000 1   0.0361   0.0361
- 0.005000 2   0.0121   0.0121
- 0.005000 3  -0.0497  -0.0497
- 0.005000 4  -0.0589  -0.0589
- 0.005000 5  -0.0187  -0.0187
- 0.005000 6   0.2092   0.2092
- 0.005000 7   0.0610   0.0610
- 0.005000 8   0.0181   0.0181
- 0.005000 9  -0.1238  -0.1238
- 0.005000 10  -0.0383  -0.0383
- 0.005000 11  -0.0114  -0.0114
- 0.005000 12  -0.0925  -0.0925
- 0.005000 13  -0.0866  -0.0866
- 0.005000 14   0.0795   0.0795
- 0.005000 15   0.0436   0.0436
- 0.005000 16  -0.0012  -0.0012
- 0.005000 17  -0.0413  -0.0413
- 0.005000 18   0.0315   0.0315
- 0.005000 19   0.1598   0.1598
- 0.005000 20  -0.0150  -0.0150
- 0.005000 21   0.0174   0.0174
- 0.005000 22  -0.0721  -0.0721
- 0.005000 23  -0.0232  -0.0232
- 0.005000 24   0.0415   0.0415
- 0.005000 25  -0.1253  -0.1253
- 0.005000 26  -0.0411  -0.0411
- 0.005000 27   0.0128   0.0128
- 0.005000 28   0.0978   0.0978
- 0.005000 29  -0.0114  -0.0114
- 0.005000 30   0.0953   0.0953
- 0.005000 31  -0.1353  -0.1353
- 0.005000 32  -0.0930  -0.0930
- 0.005000 33  -0.1495  -0.1495
- 0.005000 34   0.1628   0.1628
- 0.005000 35   0.1455   0.1455
- 0.005000 36  -0.1637  -0.1637
- 0.005000 37   0.1539   0.1539
- 0.005000 38   0.2042   0.2042
- 0.005000 39  -0.0092  -0.0092
- 0.005000 40   0.0225   0.0225
- 0.005000 41  -0.1675  -0.1675
- 0.005000 42  -0.0029  -0.0029
- 0.005000 43   0.0232   0.0232
- 0.005000 44  -0.2600  -0.2600
- 0.005000 45   0.1758   0.1758
- 0.005000 46  -0.1997  -0.1997
- 0.005000 47   0.2233   0.2233
- 0.005000 48   0.0603   0.0603
- 0.005000 49  -0.1435  -0.1435
- 0.005000 50   0.0408   0.0408
- 0.005000 51  -0.1671  -0.1671
- 0.005000 52   0.3054   0.3054
- 0.005000 53  -0.1170  -0.1170
- 0.005000 54  -0.0508  -0.0508
- 0.005000 55   0.0091   0.0091
- 0.005000 56  -0.0390  -0.0390
- 0.005000 57   0.1576   0.1576
- 0.005000 58  -0.1711  -0.1711
- 0.005000 59   0.1151   0.1151
- 0.005000 60  -0.1012  -0.1012
- 0.005000 61  -0.0710  -0.0710
- 0.005000 62   0.2224   0.2224
- 0.005000 63   0.0955   0.0955
- 0.005000 64   0.0843   0.0843
- 0.005000 65  -0.2424  -0.2424
- 0.005000 66  -0.1189  -0.1189
- 0.005000 67   0.0594   0.0594
- 0.005000 68  -0.0067  -0.0067
- 0.005000 69   0.1245   0.1245
- 0.005000 70  -0.0727  -0.0727
- 0.005000 71   0.0267   0.0267
- 0.005000 72  -1.2302  -1.2302
- 0.005000 73   0.0179   0.0179
- 0.005000 74   0.1828   0.1828
- 0.005000 75   1.6774   1.6774
- 0.005000 76  -0.0317  -0.0317
- 0.005000 77  -0.2673  -0.2673
- 0.005000 78  -0.7339  -0.7339
- 0.005000 79  -0.0097  -0.0097
- 0.005000 80   0.0588   0.0588
- 0.005000 81   0.2867   0.2867
- 0.005000 82   0.0235   0.0235
- 0.005000 83   0.0257   0.0257
- 0.005000 84  -0.2659  -0.2659
- 0.005000 85  -0.2550  -0.2550
- 0.005000 86   0.1537   0.1537
- 0.005000 87   0.4281   0.4281
- 0.005000 88   0.3637   0.3637
- 0.005000 89  -0.2142  -0.2142
- 0.005000 90  -0.3759  -0.3759
- 0.005000 91  -0.1141  -0.1141
- 0.005000 92   0.0422   0.0422
- 0.005000 93   0.2137   0.2137
- 0.005000 94   0.0055   0.0055
- 0.005000 95   0.0182   0.0182
- 0.005000 96   0.7206   0.7206
- 0.005000 97   0.0406   0.0406
- 0.005000 98  -0.4108  -0.4108
- 0.005000 99   0.0406   0.0406
- 0.005000 100  -0.1644  -0.1644
- 0.005000 101   0.1748   0.1748
- 0.005000 102  -0.4108  -0.4108
- 0.005000 103   0.1748   0.1748
- 0.005000 104  -0.5562  -0.5562
- 0.010000 0  -0.0878  -0.0878
- 0.010000 1   0.0941   0.0941
- 0.010000 2   0.0293   0.0293
- 0.010000 3  -0.1396  -0.1396
- 0.010000 4  -0.2010  -0.2010
- 0.010000 5  -0.0619  -0.0619
- 0.010000 6   0.5550   0.5550
- 0.010000 7   0.2748   0.2748
- 0.010000 8   0.0840   0.0840
- 0.010000 9  -0.3276  -0.3276
- 0.010000 10  -0.1680  -0.1680
- 0.010000 11  -0.0513  -0.0513
- 0.010000 12  -0.0737  -0.0737
- 0.010000 13  -0.0790  -0.0790
- 0.010000 14   0.0692   0.0692
- 0.010000 15   0.0283   0.0283
- 0.010000 16   0.0040   0.0040
- 0.010000 17  -0.0286  -0.0286
- 0.010000 18   0.0321   0.0321
- 0.010000 19   0.1328   0.1328
- 0.010000 20  -0.0225  -0.0225
- 0.010000 21   0.0134   0.0134
- 0.010000 22  -0.0577  -0.0577
- 0.010000 23  -0.0182  -0.0182
- 0.010000 24   0.0392   0.0392
- 0.010000 25  -0.1362  -0.1362
- 0.010000 26  -0.0422  -0.0422
- 0.010000 27   0.0200   0.0200
- 0.010000 28   0.0971   0.0971
- 0.010000 29  -0.0148  -0.0148
- 0.010000 30   0.0947   0.0947
- 0.010000 31  -0.1522  -0.1522
- 0.010000 32  -0.0947  -0.0947
- 0.010000 33  -0.1540  -0.1540
- 0.010000 34   0.1914   0.1914
- 0.010000 35   0.1516   0.1516
- 0.010000 36  -0.1499  -0.1499
- 0.010000 37   0.1475   0.1475
- 0.010000 38   0.1960   0.1960
- 0.010000 39  -0.0286  -0.0286
- 0.010000 40   0.0465   0.0465
- 0.010000 41  -0.1645  -0.1645
- 0.010000 42   0.0153   0.0153
- 0.010000 43   0.0061   0.0061
- 0.010000 44  -0.2523  -0.2523
- 0.010000 45   0.1633   0.1633
- 0.010000 46  -0.2001  -0.2001
- 0.010000 47   0.2208   0.2208
- 0.010000 48   0.0664   0.0664
- 0.010000 49  -0.1581  -0.1581
- 0.010000 50   0.0474   0.0474
- 0.010000 51  -0.1797  -0.1797
- 0.010000 52   0.3399   0.3399
- 0.010000 53  -0.1327  -0.1327
- 0.010000 54  -0.0480  -0.0480
- 0.010000 55   0.0176   0.0176
- 0.010000 56  -0.0391  -0.0391
- 0.010000 57   0.1612   0.1612
- 0.010000 58  -0.1994  -0.1994
- 0.010000 59   0.1245   0.1245
- 0.010000 60  -0.0725  -0.0725
- 0.010000 61  -0.0708  -0.0708
- 0.010000 62   0.2184   0.2184
- 0.010000 63   0.0633   0.0633
- 0.010000 64   0.0837   0.0837
- 0.010000 65  -0.2366  -0.2366
- 0.010000 66  -0.1075  -0.1075
- 0.010000 67   0.0513   0.0513
- 0.010000 68  -0.0042  -0.0042
- 0.010000 69   0.1167   0.1167
- 0.010000 70  -0.0642  -0.0642
- 0.010000 71   0.0223   0.0223
- 0.010000 72   0.2882   0.2882
- 0.010000 73   0.0151   0.0151
- 0.010000 74  -0.0540  -0.0540
- 0.010000 75  -0.1914  -0.1914
- 0.010000 76  -0.0155  -0.0155
- 0.010000 77   0.0481   0.0481
- 0.010000 78   0.0790   0.0790
- 0.010000 79  -0.0143  -0.0143
- 0.010000 80   0.0262   0.0262
- 0.010000 81  -0.1757  -0.1757
- 0.010000 82   0.0147   0.0147
- 0.010000 83  -0.0202  -0.0202
- 0.010000 84  -0.2260  -0.2260
- 0.010000 85  -0.2493  -0.2493
- 0.010000 86   0.1549   0.1549
- 0.010000 87   0.3591   0.3591
- 0.010000 88   0.3498   0.3498
- 0.010000 89  -0.2123  -0.2123
- 0.010000 90  -0.3374  -0.3374
- 0.010000 91  -0.1078  -0.1078
- 0.010000 92   0.0378   0.0378
- 0.010000 93   0.2044   0.2044
- 0.010000 94   0.0073   0.0073
- 0.010000 95   0.0195   0.0195
- 0.010000 96   0.3275   0.3275
- 0.010000 97   0.1241   0.1241
- 0.010000 98  -0.4037  -0.4037
- 0.010000 99   0.1241   0.1241
- 0.010000 100   0.0089   0.0089
- 0.010000 101   0.1813   0.1813
- 0.010000 102  -0.4037  -0.4037
- 0.010000 103   0.1813   0.1813
- 0.010000 104  -0.3364  -0.3364
- 0.015000 0  -0.1535  -0.1535
- 0.015000 1   0.1803   0.1803
- 0.015000 2   0.0500   0.0500
- 0.015000 3  -0.2381  -0.2381
- 0.015000 4  -0.5263  -0.5263
- 0.015000 5  -0.1521  -0.1521
- 0.015000 6   0.9632   0.9632
- 0.015000 7   0.8844   0.8844
- 0.015000 8   0.2606   0.2606
- 0.015000 9  -0.5716  -0.5716
- 0.015000 10  -0.5385  -0.5385
- 0.015000 11  -0.1585  -0.1585
- 0.015000 12  -0.0624  -0.0624
- 0.015000 13  -0.0749  -0.0749
- 0.015000 14   0.0649   0.0649
- 0.015000 15   0.0176   0.0176
- 0.015000 16   0.0062   0.0062
- 0.015000 17  -0.0192  -0.0192
- 0.015000 18   0.0342   0.0342
- 0.015000 19   0.1168   0.1168
- 0.015000 20  -0.0307  -0.0307
- 0.015000 21   0.0107   0.0107
- 0.015000 22  -0.0481  -0.0481
- 0.015000 23  -0.0150  -0.0150
- 0.015000 24   0.0328   0.0328
- 0.015000 25  -0.1462  -0.1462
- 0.015000 26  -0.0414  -0.0414
- 0.015000 27   0.0294   0.0294
- 0.015000 28   0.0888   0.0888
- 0.015000 29  -0.0208  -0.0208
- 0.015000 30   0.0855   0.0855
- 0.015000 31  -0.1693  -0.1693
- 0.015000 32  -0.0921  -0.0921
- 0.015000 33  -0.1477  -0.1477
- 0.015000 34   0.2267   0.2267
- 0.015000 35   0.1543   0.1543
- 0.015000 36  -0.1412  -0.1412
- 0.015000 37   0.1563   0.1563
- 0.015000 38   0.1875   0.1875
- 0.015000 39  -0.0493  -0.0493
- 0.015000 40   0.0707   0.0707
- 0.015000 41  -0.1724  -0.1724
- 0.015000 42   0.0328   0.0328
- 0.015000 43  -0.0229  -0.0229
- 0.015000 44  -0.2415  -0.2415
- 0.015000 45   0.1577   0.1577
- 0.015000 46  -0.2041  -0.2041
- 0.015000 47   0.2264   0.2264
- 0.015000 48   0.0653   0.0653
- 0.015000 49  -0.1604  -0.1604
- 0.015000 50   0.0531   0.0531
- 0.015000 51  -0.1803  -0.1803
- 0.015000 52   0.3532   0.3532
- 0.015000 53  -0.1526  -0.1526
- 0.015000 54  -0.0428  -0.0428
- 0.015000 55   0.0255   0.0255
- 0.015000 56  -0.0402  -0.0402
- 0.015000 57   0.1578   0.1578
- 0.015000 58  -0.2183  -0.2183
- 0.015000 59   0.1398   0.1398
- 0.015000 60  -0.0302  -0.0302
- 0.015000 61  -0.0650  -0.0650
- 0.015000 62   0.1977   0.1977
- 0.015000 63   0.0179   0.0179
- 0.015000 64   0.0801   0.0801
- 0.015000 65  -0.2225  -0.2225
- 0.015000 66  -0.0904  -0.0904
- 0.015000 67   0.0344   0.0344
- 0.015000 68   0.0104   0.0104
- 0.015000 69   0.1028   0.1028
- 0.015000 70  -0.0494  -0.0494
- 0.015000 71   0.0144   0.0144
- 0.015000 72   0.2761   0.2761
- 0.015000 73   0.0238   0.0238
- 0.015000 74  -0.0571  -0.0571
- 0.015000 75  -0.1910  -0.1910
- 0.015000 76  -0.0225  -0.0225
- 0.015000 77   0.0519   0.0519
- 0.015000 78   0.0731   0.0731
- 0.015000 79  -0.0147  -0.0147
- 0.015000 80   0.0284   0.0284
- 0.015000 81  -0.1582  -0.1582
- 0.015000 82   0.0134   0.0134
- 0.015000 83  -0.0232  -0.0232
- 0.015000 84  -0.1886  -0.1886
- 0.015000 85  -0.2341  -0.2341
- 0.015000 86   0.1574   0.1574
- 0.015000 87   0.2953   0.2953
- 0.015000 88   0.3230   0.3230
- 0.015000 89  -0.2125  -0.2125
- 0.015000 90  -0.2987  -0.2987
- 0.015000 91  -0.0966  -0.0966
- 0.015000 92   0.0352   0.0352
- 0.015000 93   0.1920   0.1920
- 0.015000 94   0.0076   0.0076
- 0.015000 95   0.0199   0.0199
- 0.015000 96   0.0805   0.0805
- 0.015000 97   0.1377   0.1377
- 0.015000 98  -0.4185  -0.4185
- 0.015000 99   0.1377   0.1377
- 0.015000 100   0.2115   0.2115
- 0.015000 101   0.1624   0.1624
- 0.015000 102  -0.4185  -0.4185
- 0.015000 103   0.1624   0.1624
- 0.015000 104  -0.2920  -0.2920
- 0.020000 0  -0.2027  -0.2027
- 0.020000 1   0.2564   0.2564
- 0.020000 2   0.0632   0.0632
- 0.020000 3  -0.1626  -0.1626
- 0.020000 4  -0.9163  -0.9163
- 0.020000 5  -0.2431  -0.2431
- 0.020000 6   0.8925   0.8925
- 0.020000 7   1.6918   1.6918
- 0.020000 8   0.4605   0.4605
- 0.020000 9  -0.5272  -0.5272
- 0.020000 10  -1.0320  -1.0320
- 0.020000 11  -0.2806  -0.2806
- 0.020000 12  -0.0683  -0.0683
- 0.020000 13  -0.0827  -0.0827
- 0.020000 14   0.0756   0.0756
- 0.020000 15   0.0153   0.0153
- 0.020000 16   0.0064   0.0064
- 0.020000 17  -0.0177  -0.0177
- 0.020000 18   0.0412   0.0412
- 0.020000 19   0.1278   0.1278
- 0.020000 20  -0.0410  -0.0410
- 0.020000 21   0.0118   0.0118
- 0.020000 22  -0.0516  -0.0516
- 0.020000 23  -0.0169  -0.0169
- 0.020000 24   0.0325   0.0325
- 0.020000 25  -0.1489  -0.1489
- 0.020000 26  -0.0383  -0.0383
- 0.020000 27   0.0296   0.0296
- 0.020000 28   0.0777   0.0777
- 0.020000 29  -0.0248  -0.0248
- 0.020000 30   0.0807   0.0807
- 0.020000 31  -0.1714  -0.1714
- 0.020000 32  -0.0858  -0.0858
- 0.020000 33  -0.1429  -0.1429
- 0.020000 34   0.2426   0.2426
- 0.020000 35   0.1489   0.1489
- 0.020000 36  -0.1241  -0.1241
- 0.020000 37   0.1558   0.1558
- 0.020000 38   0.1741   0.1741
- 0.020000 39  -0.0543  -0.0543
- 0.020000 40   0.0705   0.0705
- 0.020000 41  -0.1847  -0.1847
- 0.020000 42   0.0351   0.0351
- 0.020000 43  -0.0425  -0.0425
- 0.020000 44  -0.2183  -0.2183
- 0.020000 45   0.1433   0.1433
- 0.020000 46  -0.1839  -0.1839
- 0.020000 47   0.2288   0.2288
- 0.020000 48   0.0562   0.0562
- 0.020000 49  -0.1493  -0.1493
- 0.020000 50   0.0525   0.0525
- 0.020000 51  -0.1626  -0.1626
- 0.020000 52   0.3303   0.3303
- 0.020000 53  -0.1629  -0.1629
- 0.020000 54  -0.0384  -0.0384
- 0.020000 55   0.0320   0.0320
- 0.020000 56  -0.0434  -0.0434
- 0.020000 57   0.1448   0.1448
- 0.020000 58  -0.2130  -0.2130
- 0.020000 59   0.1538   0.1538
- 0.020000 60  -0.0027  -0.0027
- 0.020000 61  -0.0548  -0.0548
- 0.020000 62   0.1651   0.1651
- 0.020000 63  -0.0126  -0.0126
- 0.020000 64   0.0708   0.0708
- 0.020000 65  -0.1933  -0.1933
- 0.020000 66  -0.0731  -0.0731
- 0.020000 67   0.0237   0.0237
- 0.020000 68   0.0207   0.0207
- 0.020000 69   0.0884   0.0884
- 0.020000 70  -0.0397  -0.0397
- 0.020000 71   0.0076   0.0076
- 0.020000 72   0.2868   0.2868
- 0.020000 73   0.0276   0.0276
- 0.020000 74  -0.0545  -0.0545
- 0.020000 75  -0.2066  -0.2066
- 0.020000 76  -0.0254  -0.0254
- 0.020000 77   0.0507   0.0507
- 0.020000 78   0.0782   0.0782
- 0.020000 79  -0.0140  -0.0140
- 0.020000 80   0.0296   0.0296
- 0.020000 81  -0.1585  -0.1585
- 0.020000 82   0.0118   0.0118
- 0.020000 83  -0.0258  -0.0258
- 0.020000 84  -0.1759  -0.1759
- 0.020000 85  -0.2245  -0.2245
- 0.020000 86   0.1480   0.1480
- 0.020000 87   0.2912   0.2912
- 0.020000 88   0.3104   0.3104
- 0.020000 89  -0.1981  -0.1981
- 0.020000 90  -0.3037  -0.3037
- 0.020000 91  -0.0940  -0.0940
- 0.020000 92   0.0306   0.0306
- 0.020000 93   0.1884   0.1884
- 0.020000 94   0.0081   0.0081
- 0.020000 95   0.0195   0.0195
- 0.020000 96  -0.0480  -0.0480
- 0.020000 97   0.0463   0.0463
- 0.020000 98  -0.4386  -0.4386
- 0.020000 99   0.0463   0.0463
- 0.020000 100   0.2798   0.2798
- 0.020000 101   0.1279   0.1279
- 0.020000 102  -0.4386  -0.4386
- 0.020000 103   0.1279   0.1279
- 0.020000 104  -0.2318  -0.2318
+#! FIELDS time parameter c1
+ 0.000000 0  -0.0023
+ 0.000000 1   0.0023
+ 0.000000 2   0.0008
+ 0.000000 3  -0.0027
+ 0.000000 4  -0.0030
+ 0.000000 5  -0.0010
+ 0.000000 6   0.0126
+ 0.000000 7   0.0021
+ 0.000000 8   0.0006
+ 0.000000 9  -0.0076
+ 0.000000 10  -0.0014
+ 0.000000 11  -0.0004
+ 0.000000 12  -0.1068
+ 0.000000 13  -0.0978
+ 0.000000 14   0.0943
+ 0.000000 15   0.0592
+ 0.000000 16  -0.0011
+ 0.000000 17  -0.0556
+ 0.000000 18   0.0234
+ 0.000000 19   0.1834
+ 0.000000 20  -0.0108
+ 0.000000 21   0.0243
+ 0.000000 22  -0.0845
+ 0.000000 23  -0.0279
+ 0.000000 24   0.0377
+ 0.000000 25  -0.1134
+ 0.000000 26  -0.0379
+ 0.000000 27   0.0123
+ 0.000000 28   0.0956
+ 0.000000 29  -0.0118
+ 0.000000 30   0.0879
+ 0.000000 31  -0.1220
+ 0.000000 32  -0.0879
+ 0.000000 33  -0.1379
+ 0.000000 34   0.1399
+ 0.000000 35   0.1376
+ 0.000000 36  -0.1868
+ 0.000000 37   0.1816
+ 0.000000 38   0.2145
+ 0.000000 39  -0.0037
+ 0.000000 40   0.0112
+ 0.000000 41  -0.1880
+ 0.000000 42  -0.0093
+ 0.000000 43   0.0195
+ 0.000000 44  -0.2515
+ 0.000000 45   0.1999
+ 0.000000 46  -0.2123
+ 0.000000 47   0.2250
+ 0.000000 48   0.0481
+ 0.000000 49  -0.1259
+ 0.000000 50   0.0384
+ 0.000000 51  -0.1440
+ 0.000000 52   0.2683
+ 0.000000 53  -0.1172
+ 0.000000 54  -0.0504
+ 0.000000 55   0.0087
+ 0.000000 56  -0.0429
+ 0.000000 57   0.1463
+ 0.000000 58  -0.1512
+ 0.000000 59   0.1218
+ 0.000000 60  -0.0873
+ 0.000000 61  -0.0686
+ 0.000000 62   0.2131
+ 0.000000 63   0.0814
+ 0.000000 64   0.0863
+ 0.000000 65  -0.2416
+ 0.000000 66  -0.1096
+ 0.000000 67   0.0507
+ 0.000000 68   0.0043
+ 0.000000 69   0.1156
+ 0.000000 70  -0.0684
+ 0.000000 71   0.0242
+ 0.000000 72  -0.9759
+ 0.000000 73  -0.0191
+ 0.000000 74   0.0303
+ 0.000000 75   1.3232
+ 0.000000 76   0.0240
+ 0.000000 77  -0.0463
+ 0.000000 78  -0.6202
+ 0.000000 79  -0.0184
+ 0.000000 80   0.0024
+ 0.000000 81   0.2729
+ 0.000000 82   0.0135
+ 0.000000 83   0.0136
+ 0.000000 84  -0.2793
+ 0.000000 85  -0.2587
+ 0.000000 86   0.1898
+ 0.000000 87   0.4427
+ 0.000000 88   0.3809
+ 0.000000 89  -0.2772
+ 0.000000 90  -0.3711
+ 0.000000 91  -0.1266
+ 0.000000 92   0.0760
+ 0.000000 93   0.2077
+ 0.000000 94   0.0044
+ 0.000000 95   0.0114
+ 0.000000 96   0.6933
+ 0.000000 97  -0.0140
+ 0.000000 98  -0.4462
+ 0.000000 99  -0.0140
+ 0.000000 100  -0.1875
+ 0.000000 101   0.1721
+ 0.000000 102  -0.4462
+ 0.000000 103   0.1721
+ 0.000000 104  -0.5058
+ 0.005000 0  -0.0357
+ 0.005000 1   0.0361
+ 0.005000 2   0.0121
+ 0.005000 3  -0.0497
+ 0.005000 4  -0.0589
+ 0.005000 5  -0.0187
+ 0.005000 6   0.2092
+ 0.005000 7   0.0610
+ 0.005000 8   0.0181
+ 0.005000 9  -0.1238
+ 0.005000 10  -0.0383
+ 0.005000 11  -0.0114
+ 0.005000 12  -0.0925
+ 0.005000 13  -0.0866
+ 0.005000 14   0.0795
+ 0.005000 15   0.0436
+ 0.005000 16  -0.0012
+ 0.005000 17  -0.0413
+ 0.005000 18   0.0315
+ 0.005000 19   0.1598
+ 0.005000 20  -0.0150
+ 0.005000 21   0.0174
+ 0.005000 22  -0.0721
+ 0.005000 23  -0.0232
+ 0.005000 24   0.0415
+ 0.005000 25  -0.1253
+ 0.005000 26  -0.0411
+ 0.005000 27   0.0128
+ 0.005000 28   0.0978
+ 0.005000 29  -0.0114
+ 0.005000 30   0.0953
+ 0.005000 31  -0.1353
+ 0.005000 32  -0.0930
+ 0.005000 33  -0.1495
+ 0.005000 34   0.1628
+ 0.005000 35   0.1455
+ 0.005000 36  -0.1637
+ 0.005000 37   0.1539
+ 0.005000 38   0.2042
+ 0.005000 39  -0.0092
+ 0.005000 40   0.0225
+ 0.005000 41  -0.1675
+ 0.005000 42  -0.0029
+ 0.005000 43   0.0232
+ 0.005000 44  -0.2600
+ 0.005000 45   0.1758
+ 0.005000 46  -0.1997
+ 0.005000 47   0.2233
+ 0.005000 48   0.0603
+ 0.005000 49  -0.1435
+ 0.005000 50   0.0408
+ 0.005000 51  -0.1671
+ 0.005000 52   0.3054
+ 0.005000 53  -0.1170
+ 0.005000 54  -0.0508
+ 0.005000 55   0.0091
+ 0.005000 56  -0.0390
+ 0.005000 57   0.1576
+ 0.005000 58  -0.1711
+ 0.005000 59   0.1151
+ 0.005000 60  -0.1012
+ 0.005000 61  -0.0710
+ 0.005000 62   0.2224
+ 0.005000 63   0.0955
+ 0.005000 64   0.0843
+ 0.005000 65  -0.2424
+ 0.005000 66  -0.1189
+ 0.005000 67   0.0594
+ 0.005000 68  -0.0067
+ 0.005000 69   0.1245
+ 0.005000 70  -0.0727
+ 0.005000 71   0.0267
+ 0.005000 72  -1.2302
+ 0.005000 73   0.0179
+ 0.005000 74   0.1828
+ 0.005000 75   1.6774
+ 0.005000 76  -0.0317
+ 0.005000 77  -0.2673
+ 0.005000 78  -0.7339
+ 0.005000 79  -0.0097
+ 0.005000 80   0.0588
+ 0.005000 81   0.2867
+ 0.005000 82   0.0235
+ 0.005000 83   0.0257
+ 0.005000 84  -0.2659
+ 0.005000 85  -0.2550
+ 0.005000 86   0.1537
+ 0.005000 87   0.4281
+ 0.005000 88   0.3637
+ 0.005000 89  -0.2142
+ 0.005000 90  -0.3759
+ 0.005000 91  -0.1141
+ 0.005000 92   0.0422
+ 0.005000 93   0.2137
+ 0.005000 94   0.0055
+ 0.005000 95   0.0182
+ 0.005000 96   0.7206
+ 0.005000 97   0.0406
+ 0.005000 98  -0.4108
+ 0.005000 99   0.0406
+ 0.005000 100  -0.1644
+ 0.005000 101   0.1748
+ 0.005000 102  -0.4108
+ 0.005000 103   0.1748
+ 0.005000 104  -0.5562
+ 0.010000 0  -0.0878
+ 0.010000 1   0.0941
+ 0.010000 2   0.0293
+ 0.010000 3  -0.1396
+ 0.010000 4  -0.2010
+ 0.010000 5  -0.0619
+ 0.010000 6   0.5550
+ 0.010000 7   0.2748
+ 0.010000 8   0.0840
+ 0.010000 9  -0.3276
+ 0.010000 10  -0.1680
+ 0.010000 11  -0.0513
+ 0.010000 12  -0.0737
+ 0.010000 13  -0.0790
+ 0.010000 14   0.0692
+ 0.010000 15   0.0283
+ 0.010000 16   0.0040
+ 0.010000 17  -0.0286
+ 0.010000 18   0.0321
+ 0.010000 19   0.1328
+ 0.010000 20  -0.0225
+ 0.010000 21   0.0134
+ 0.010000 22  -0.0577
+ 0.010000 23  -0.0182
+ 0.010000 24   0.0392
+ 0.010000 25  -0.1362
+ 0.010000 26  -0.0422
+ 0.010000 27   0.0200
+ 0.010000 28   0.0971
+ 0.010000 29  -0.0148
+ 0.010000 30   0.0947
+ 0.010000 31  -0.1522
+ 0.010000 32  -0.0947
+ 0.010000 33  -0.1540
+ 0.010000 34   0.1914
+ 0.010000 35   0.1516
+ 0.010000 36  -0.1499
+ 0.010000 37   0.1475
+ 0.010000 38   0.1960
+ 0.010000 39  -0.0286
+ 0.010000 40   0.0465
+ 0.010000 41  -0.1645
+ 0.010000 42   0.0153
+ 0.010000 43   0.0061
+ 0.010000 44  -0.2523
+ 0.010000 45   0.1633
+ 0.010000 46  -0.2001
+ 0.010000 47   0.2208
+ 0.010000 48   0.0664
+ 0.010000 49  -0.1581
+ 0.010000 50   0.0474
+ 0.010000 51  -0.1797
+ 0.010000 52   0.3399
+ 0.010000 53  -0.1327
+ 0.010000 54  -0.0480
+ 0.010000 55   0.0176
+ 0.010000 56  -0.0391
+ 0.010000 57   0.1612
+ 0.010000 58  -0.1994
+ 0.010000 59   0.1245
+ 0.010000 60  -0.0725
+ 0.010000 61  -0.0708
+ 0.010000 62   0.2184
+ 0.010000 63   0.0633
+ 0.010000 64   0.0837
+ 0.010000 65  -0.2366
+ 0.010000 66  -0.1075
+ 0.010000 67   0.0513
+ 0.010000 68  -0.0042
+ 0.010000 69   0.1167
+ 0.010000 70  -0.0642
+ 0.010000 71   0.0223
+ 0.010000 72   0.2882
+ 0.010000 73   0.0151
+ 0.010000 74  -0.0540
+ 0.010000 75  -0.1914
+ 0.010000 76  -0.0155
+ 0.010000 77   0.0481
+ 0.010000 78   0.0790
+ 0.010000 79  -0.0143
+ 0.010000 80   0.0262
+ 0.010000 81  -0.1757
+ 0.010000 82   0.0147
+ 0.010000 83  -0.0202
+ 0.010000 84  -0.2260
+ 0.010000 85  -0.2493
+ 0.010000 86   0.1549
+ 0.010000 87   0.3591
+ 0.010000 88   0.3498
+ 0.010000 89  -0.2123
+ 0.010000 90  -0.3374
+ 0.010000 91  -0.1078
+ 0.010000 92   0.0378
+ 0.010000 93   0.2044
+ 0.010000 94   0.0073
+ 0.010000 95   0.0195
+ 0.010000 96   0.3275
+ 0.010000 97   0.1241
+ 0.010000 98  -0.4037
+ 0.010000 99   0.1241
+ 0.010000 100   0.0089
+ 0.010000 101   0.1813
+ 0.010000 102  -0.4037
+ 0.010000 103   0.1813
+ 0.010000 104  -0.3364
+ 0.015000 0  -0.1535
+ 0.015000 1   0.1803
+ 0.015000 2   0.0500
+ 0.015000 3  -0.2381
+ 0.015000 4  -0.5263
+ 0.015000 5  -0.1521
+ 0.015000 6   0.9632
+ 0.015000 7   0.8844
+ 0.015000 8   0.2606
+ 0.015000 9  -0.5716
+ 0.015000 10  -0.5385
+ 0.015000 11  -0.1585
+ 0.015000 12  -0.0624
+ 0.015000 13  -0.0749
+ 0.015000 14   0.0649
+ 0.015000 15   0.0176
+ 0.015000 16   0.0062
+ 0.015000 17  -0.0192
+ 0.015000 18   0.0342
+ 0.015000 19   0.1168
+ 0.015000 20  -0.0307
+ 0.015000 21   0.0107
+ 0.015000 22  -0.0481
+ 0.015000 23  -0.0150
+ 0.015000 24   0.0328
+ 0.015000 25  -0.1462
+ 0.015000 26  -0.0414
+ 0.015000 27   0.0294
+ 0.015000 28   0.0888
+ 0.015000 29  -0.0208
+ 0.015000 30   0.0855
+ 0.015000 31  -0.1693
+ 0.015000 32  -0.0921
+ 0.015000 33  -0.1477
+ 0.015000 34   0.2267
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+ 0.015000 36  -0.1412
+ 0.015000 37   0.1563
+ 0.015000 38   0.1875
+ 0.015000 39  -0.0493
+ 0.015000 40   0.0707
+ 0.015000 41  -0.1724
+ 0.015000 42   0.0328
+ 0.015000 43  -0.0229
+ 0.015000 44  -0.2415
+ 0.015000 45   0.1577
+ 0.015000 46  -0.2041
+ 0.015000 47   0.2264
+ 0.015000 48   0.0653
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+ 0.015000 53  -0.1526
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+ 0.015000 55   0.0255
+ 0.015000 56  -0.0402
+ 0.015000 57   0.1578
+ 0.015000 58  -0.2183
+ 0.015000 59   0.1398
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+ 0.015000 61  -0.0650
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+ 0.015000 65  -0.2225
+ 0.015000 66  -0.0904
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+ 0.015000 82   0.0134
+ 0.015000 83  -0.0232
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+ 0.015000 85  -0.2341
+ 0.015000 86   0.1574
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+ 0.015000 94   0.0076
+ 0.015000 95   0.0199
+ 0.015000 96   0.0805
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+ 0.020000 0  -0.2027
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+ 0.020000 5  -0.2431
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+ 0.020000 59   0.1538
+ 0.020000 60  -0.0027
+ 0.020000 61  -0.0548
+ 0.020000 62   0.1651
+ 0.020000 63  -0.0126
+ 0.020000 64   0.0708
+ 0.020000 65  -0.1933
+ 0.020000 66  -0.0731
+ 0.020000 67   0.0237
+ 0.020000 68   0.0207
+ 0.020000 69   0.0884
+ 0.020000 70  -0.0397
+ 0.020000 71   0.0076
+ 0.020000 72   0.2868
+ 0.020000 73   0.0276
+ 0.020000 74  -0.0545
+ 0.020000 75  -0.2066
+ 0.020000 76  -0.0254
+ 0.020000 77   0.0507
+ 0.020000 78   0.0782
+ 0.020000 79  -0.0140
+ 0.020000 80   0.0296
+ 0.020000 81  -0.1585
+ 0.020000 82   0.0118
+ 0.020000 83  -0.0258
+ 0.020000 84  -0.1759
+ 0.020000 85  -0.2245
+ 0.020000 86   0.1480
+ 0.020000 87   0.2912
+ 0.020000 88   0.3104
+ 0.020000 89  -0.1981
+ 0.020000 90  -0.3037
+ 0.020000 91  -0.0940
+ 0.020000 92   0.0306
+ 0.020000 93   0.1884
+ 0.020000 94   0.0081
+ 0.020000 95   0.0195
+ 0.020000 96  -0.0480
+ 0.020000 97   0.0463
+ 0.020000 98  -0.4386
+ 0.020000 99   0.0463
+ 0.020000 100   0.2798
+ 0.020000 101   0.1279
+ 0.020000 102  -0.4386
+ 0.020000 103   0.1279
+ 0.020000 104  -0.2318
diff --git a/regtest/multicolvar/rt25/plumed.dat b/regtest/multicolvar/rt25/plumed.dat
index a9fc93f014db3711a545e77e12569b9915a14888..ed370346031a361290ed3f767105e1650efd7fc3 100644
--- a/regtest/multicolvar/rt25/plumed.dat
+++ b/regtest/multicolvar/rt25/plumed.dat
@@ -10,20 +10,7 @@ ATOMS8=2,4,17,9
 REFERENCE=1 
 LABEL=c1
 ...
-ALPHABETA ... 
-REFERENCE=1 
-NUMERICAL_DERIVATIVES 
-LABEL=c1num
-ATOMS1=1,3,6,10 
-ATOMS2=2,4,7,9 
-ATOMS3=3,5,6,7 
-ATOMS4=2,1,3,4 
-ATOMS5=12,14,17,19 
-ATOMS6=22,24,27,29 
-ATOMS7=21,20,5,9 
-ATOMS8=2,4,17,9 
-...
 
-DUMPDERIVATIVES ARG=c1.*,c1num.* STRIDE=1 FILE=derivatives FMT=%8.4f
+DUMPDERIVATIVES ARG=c1.* STRIDE=1 FILE=derivatives FMT=%8.4f
 
 RESTRAINT ARG=c1 AT=-2 KAPPA=0 SLOPE=1