diff --git a/regtest/logmfd/Makefile b/regtest/logmfd/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..42480767ae852294cf2d7269ac5a1c16064d1849
--- /dev/null
+++ b/regtest/logmfd/Makefile
@@ -0,0 +1,2 @@
+include ../scripts/module.make
+
diff --git a/regtest/logmfd/input.xyz b/regtest/logmfd/input.xyz
new file mode 100644
index 0000000000000000000000000000000000000000..bd0d514ea89d6c5a1a2053cf5781474e7a7f7094
--- /dev/null
+++ b/regtest/logmfd/input.xyz
@@ -0,0 +1,110 @@
+108
+5.0388 5.0388 5.0388
+Ar 0 0 0
+Ar 0.8398 0 0.8398
+Ar 0.8398 0.8398 0
+Ar 0 0.8398 0.8398
+Ar 0 0 1.6796
+Ar 0.8398 0 2.5194
+Ar 0.8398 0.8398 1.6796
+Ar 0 0.8398 2.5194
+Ar 0 0 3.3592
+Ar 0.8398 0 4.199
+Ar 0.8398 0.8398 3.3592
+Ar 0 0.8398 4.199
+Ar 0 1.6796 0
+Ar 0.8398 1.6796 0.8398
+Ar 0.8398 2.5194 0
+Ar 0 2.5194 0.8398
+Ar 0 1.6796 1.6796
+Ar 0.8398 1.6796 2.5194
+Ar 0.8398 2.5194 1.6796
+Ar 0 2.5194 2.5194
+Ar 0 1.6796 3.3592
+Ar 0.8398 1.6796 4.199
+Ar 0.8398 2.5194 3.3592
+Ar 0 2.5194 4.199
+Ar 0 3.3592 0
+Ar 0.8398 3.3592 0.8398
+Ar 0.8398 4.199 0
+Ar 0 4.199 0.8398
+Ar 0 3.3592 1.6796
+Ar 0.8398 3.3592 2.5194
+Ar 0.8398 4.199 1.6796
+Ar 0 4.199 2.5194
+Ar 0 3.3592 3.3592
+Ar 0.8398 3.3592 4.199
+Ar 0.8398 4.199 3.3592
+Ar 0 4.199 4.199
+Ar 1.6796 0 0
+Ar 2.5194 0 0.8398
+Ar 2.5194 0.8398 0
+Ar 1.6796 0.8398 0.8398
+Ar 1.6796 0 1.6796
+Ar 2.5194 0 2.5194
+Ar 2.5194 0.8398 1.6796
+Ar 1.6796 0.8398 2.5194
+Ar 1.6796 0 3.3592
+Ar 2.5194 0 4.199
+Ar 2.5194 0.8398 3.3592
+Ar 1.6796 0.8398 4.199
+Ar 1.6796 1.6796 0
+Ar 2.5194 1.6796 0.8398
+Ar 2.5194 2.5194 0
+Ar 1.6796 2.5194 0.8398
+Ar 1.6796 1.6796 1.6796
+Ar 2.5194 1.6796 2.5194
+Ar 2.5194 2.5194 1.6796
+Ar 1.6796 2.5194 2.5194
+Ar 1.6796 1.6796 3.3592
+Ar 2.5194 1.6796 4.199
+Ar 2.5194 2.5194 3.3592
+Ar 1.6796 2.5194 4.199
+Ar 1.6796 3.3592 0
+Ar 2.5194 3.3592 0.8398
+Ar 2.5194 4.199 0
+Ar 1.6796 4.199 0.8398
+Ar 1.6796 3.3592 1.6796
+Ar 2.5194 3.3592 2.5194
+Ar 2.5194 4.199 1.6796
+Ar 1.6796 4.199 2.5194
+Ar 1.6796 3.3592 3.3592
+Ar 2.5194 3.3592 4.199
+Ar 2.5194 4.199 3.3592
+Ar 1.6796 4.199 4.199
+Ar 3.3592 0 0
+Ar 4.199 0 0.8398
+Ar 4.199 0.8398 0
+Ar 3.3592 0.8398 0.8398
+Ar 3.3592 0 1.6796
+Ar 4.199 0 2.5194
+Ar 4.199 0.8398 1.6796
+Ar 3.3592 0.8398 2.5194
+Ar 3.3592 0 3.3592
+Ar 4.199 0 4.199
+Ar 4.199 0.8398 3.3592
+Ar 3.3592 0.8398 4.199
+Ar 3.3592 1.6796 0
+Ar 4.199 1.6796 0.8398
+Ar 4.199 2.5194 0
+Ar 3.3592 2.5194 0.8398
+Ar 3.3592 1.6796 1.6796
+Ar 4.199 1.6796 2.5194
+Ar 4.199 2.5194 1.6796
+Ar 3.3592 2.5194 2.5194
+Ar 3.3592 1.6796 3.3592
+Ar 4.199 1.6796 4.199
+Ar 4.199 2.5194 3.3592
+Ar 3.3592 2.5194 4.199
+Ar 3.3592 3.3592 0
+Ar 4.199 3.3592 0.8398
+Ar 4.199 4.199 0
+Ar 3.3592 4.199 0.8398
+Ar 3.3592 3.3592 1.6796
+Ar 4.199 3.3592 2.5194
+Ar 4.199 4.199 1.6796
+Ar 3.3592 4.199 2.5194
+Ar 3.3592 3.3592 3.3592
+Ar 4.199 3.3592 4.199
+Ar 4.199 4.199 3.3592
+Ar 3.3592 4.199 4.199
diff --git a/regtest/logmfd/rt-logmfd-nve/COLVAR.reference b/regtest/logmfd/rt-logmfd-nve/COLVAR.reference
new file mode 100644
index 0000000000000000000000000000000000000000..39c2211d236551a0e00e88ee1d3f52488b3bea2d
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/COLVAR.reference
@@ -0,0 +1,6 @@
+#! FIELDS time d logmfd.d_fict
+ 0.500000 1.173063 1.500000
+ 1.000000 1.207470 1.499699
+ 1.500000 1.264623 1.499227
+ 2.000000 1.364253 1.498662
+ 2.500000 1.456331 1.498167
diff --git a/regtest/logmfd/rt-logmfd-nve/Makefile b/regtest/logmfd/rt-logmfd-nve/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3703b27cea227aa053fb6d1d73f861e4384dbcee
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/Makefile
@@ -0,0 +1 @@
+include ../../scripts/test.make
diff --git a/regtest/logmfd/rt-logmfd-nve/config b/regtest/logmfd/rt-logmfd-nve/config
new file mode 100644
index 0000000000000000000000000000000000000000..fb67c7e879f8e91a6a8e1a18c060bb417133e050
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/config
@@ -0,0 +1,6 @@
+type=simplemd
+plumed_modules=logmfd
+arg="--plumed plumed.dat < in"
+extra_files="../input.xyz"
+
+
diff --git a/regtest/logmfd/rt-logmfd-nve/in b/regtest/logmfd/rt-logmfd-nve/in
new file mode 100644
index 0000000000000000000000000000000000000000..8dd8cd686299c8d25dae4397657dcbc57f750a33
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/in
@@ -0,0 +1,10 @@
+inputfile input.xyz
+outputfile output.xyz
+temperature 1.2
+tstep 0.005
+friction 1
+forcecutoff 2.5
+listcutoff  3.0
+nstep 500
+nconfig 100 trajectory.xyz
+nstat   10 energies.dat
diff --git a/regtest/logmfd/rt-logmfd-nve/logmfd.out.reference b/regtest/logmfd/rt-logmfd-nve/logmfd.out.reference
new file mode 100644
index 0000000000000000000000000000000000000000..224cf98d5b2bfc31fa2a6478f539156f3d497592
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/logmfd.out.reference
@@ -0,0 +1,11 @@
+# LogMFD
+# CVs : d
+# Mass for CV particles :    1000.000000000
+# Mass for thermostat   :   24943.386300000
+# 1:iter_md, 2:Flog, 3:2*Ekin/gkb[K], 4:eta, 5:Veta,
+# 6:d_fict(t), 7:d_vfict(t), 8:d_force(t),
+       1       9.99256918       0.04361201       0.00000000       0.00000000       1.49969891      -0.00060217     -49.37805290 
+       2       9.98176170       0.10709839       0.00000000       0.00000000       1.49922709      -0.00094364     -27.98052199 
+       3       9.97382199       0.15378142       0.00000000       0.00000000       1.49866171      -0.00113076     -15.31583986 
+       4       9.97995043       0.11774488       0.00000000       0.00000000       1.49816700      -0.00098944      11.55859414 
+       5       9.98693691       0.07668930       0.00000000       0.00000000       1.49776774      -0.00079852      15.62476247 
diff --git a/regtest/logmfd/rt-logmfd-nve/plumed.dat b/regtest/logmfd/rt-logmfd-nve/plumed.dat
new file mode 100644
index 0000000000000000000000000000000000000000..b2f04489d98a699066648dbd1df9c2ce8a83ddde
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/plumed.dat
@@ -0,0 +1,12 @@
+# LogMFD parameters NVE
+
+d: DISTANCE ATOMS=1,2
+
+LOGMFD ...
+ LABEL=logmfd
+ ARG=d
+ KAPPA=50000 DELTA_T=0.5 INTERVAL=100 TEMP=300.0 FLOG=10.0 FICT=1.5 MFICT=1000 VFICT=0.00
+ ALPHA=4.0 THERMOSTAT=NVE FICT_MIN=0.0 FICT_MAX=10.0,
+ ... LOGMFD
+
+PRINT ARG=d,logmfd.d_fict STRIDE=100 FILE=COLVAR
diff --git a/regtest/logmfd/rt-logmfd-nve/replica.out.reference b/regtest/logmfd/rt-logmfd-nve/replica.out.reference
new file mode 100644
index 0000000000000000000000000000000000000000..7e011c95c2f400e0d700c318ff04ed47bca0c885
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nve/replica.out.reference
@@ -0,0 +1,8 @@
+# Replica No. 0 of 1.
+# 1:iter_md, 2:work, 3:weight,
+# 4:d(q)
+       1    0.000000e+00     1.000000e+00        1.49901244 
+       2   -8.424535e-03     1.000000e+00        1.49913930 
+       3   -1.565089e-02     1.000000e+00        1.49892078 
+       4   -9.115915e-03     1.000000e+00        1.49889289 
+       5   -1.386056e-03     1.000000e+00        1.49847949 
diff --git a/regtest/logmfd/rt-logmfd-nvt/COLVAR.reference b/regtest/logmfd/rt-logmfd-nvt/COLVAR.reference
new file mode 100644
index 0000000000000000000000000000000000000000..9d69226f11402a92bebe5c7ccdb71d7eb0b6c643
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/COLVAR.reference
@@ -0,0 +1,6 @@
+#! FIELDS time d logmfd.d_fict
+ 0.500000 1.173063 1.500000
+ 1.000000 1.207470 1.499699
+ 1.500000 1.264623 1.499227
+ 2.000000 1.364253 1.498660
+ 2.500000 1.456331 1.498163
diff --git a/regtest/logmfd/rt-logmfd-nvt/Makefile b/regtest/logmfd/rt-logmfd-nvt/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3703b27cea227aa053fb6d1d73f861e4384dbcee
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/Makefile
@@ -0,0 +1 @@
+include ../../scripts/test.make
diff --git a/regtest/logmfd/rt-logmfd-nvt/config b/regtest/logmfd/rt-logmfd-nvt/config
new file mode 100644
index 0000000000000000000000000000000000000000..fb67c7e879f8e91a6a8e1a18c060bb417133e050
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/config
@@ -0,0 +1,6 @@
+type=simplemd
+plumed_modules=logmfd
+arg="--plumed plumed.dat < in"
+extra_files="../input.xyz"
+
+
diff --git a/regtest/logmfd/rt-logmfd-nvt/in b/regtest/logmfd/rt-logmfd-nvt/in
new file mode 100644
index 0000000000000000000000000000000000000000..8dd8cd686299c8d25dae4397657dcbc57f750a33
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/in
@@ -0,0 +1,10 @@
+inputfile input.xyz
+outputfile output.xyz
+temperature 1.2
+tstep 0.005
+friction 1
+forcecutoff 2.5
+listcutoff  3.0
+nstep 500
+nconfig 100 trajectory.xyz
+nstat   10 energies.dat
diff --git a/regtest/logmfd/rt-logmfd-nvt/logmfd.out.reference b/regtest/logmfd/rt-logmfd-nvt/logmfd.out.reference
new file mode 100644
index 0000000000000000000000000000000000000000..43608d959e95983a543640f651bf86e438713717
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/logmfd.out.reference
@@ -0,0 +1,11 @@
+# LogMFD
+# CVs : d
+# Mass for CV particles :    1000.000000000
+# Mass for thermostat   :    1000.000000000
+# 1:iter_md, 2:Flog, 3:2*Ekin/gkb[K], 4:eta, 5:Veta,
+# 6:d_fict(t), 7:d_vfict(t), 8:d_force(t),
+       1       9.99257112       0.04362783      -0.00031175      -0.00124699       1.49969886      -0.00060228     -49.37805290 
+       2       9.98177141       0.10726915      -0.00124692      -0.00249371       1.49922666      -0.00094440     -27.98051515 
+       3       9.97384458       0.15435749      -0.00280541      -0.00374024       1.49866023      -0.00113287     -15.31577787 
+       4       9.97999107       0.11873308      -0.00498720      -0.00498691       1.49816344      -0.00099358      11.55896356 
+       5       9.98700853       0.07793288      -0.00779237      -0.00623376       1.49776095      -0.00080497      15.62528327 
diff --git a/regtest/logmfd/rt-logmfd-nvt/plumed.dat b/regtest/logmfd/rt-logmfd-nvt/plumed.dat
new file mode 100644
index 0000000000000000000000000000000000000000..cb116319ac244018d73d04eeaf8296f2bc567f96
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/plumed.dat
@@ -0,0 +1,24 @@
+# LogMFD parameters NVT
+
+d: DISTANCE ATOMS=1,2
+
+LOGMFD ...
+ LABEL=logmfd
+ ARG=d
+ KAPPA=50000.0
+ DELTA_T=0.5
+ INTERVAL=100
+ TEMP=300.0
+ FLOG=10.0
+ FICT=1.5
+ MFICT=1000
+ VFICT=0.00
+ ALPHA=4.0
+ THERMOSTAT=NVT
+ FICT_MIN=0.0
+ FICT_MAX=10.0
+ VETA=0.0
+ META=1000.0
+... LOGMFD
+
+PRINT ARG=d,logmfd.d_fict STRIDE=100 FILE=COLVAR
diff --git a/regtest/logmfd/rt-logmfd-nvt/replica.out.reference b/regtest/logmfd/rt-logmfd-nvt/replica.out.reference
new file mode 100644
index 0000000000000000000000000000000000000000..4dd31b8889746a6c81a61ea7d9d4d8b291c99e2f
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-nvt/replica.out.reference
@@ -0,0 +1,8 @@
+# Replica No. 0 of 1.
+# 1:iter_md, 2:work, 3:weight,
+# 4:d(q)
+       1    0.000000e+00     1.000000e+00        1.49901244 
+       2   -8.426061e-03     1.000000e+00        1.49913925 
+       3   -1.565815e-02     1.000000e+00        1.49892035 
+       4   -9.110732e-03     1.000000e+00        1.49889140 
+       5   -1.348246e-03     1.000000e+00        1.49847594 
diff --git a/regtest/logmfd/rt-logmfd-vs/COLVAR.reference b/regtest/logmfd/rt-logmfd-vs/COLVAR.reference
new file mode 100644
index 0000000000000000000000000000000000000000..e39ffed953d96ffe1d721c8670749b8969090df0
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/COLVAR.reference
@@ -0,0 +1,6 @@
+#! FIELDS time d logmfd.d_fict
+ 0.500000 1.173063 1.500000
+ 1.000000 1.206032 1.524972
+ 1.500000 1.260549 1.549943
+ 2.000000 1.350710 1.574915
+ 2.500000 1.428247 1.599887
diff --git a/regtest/logmfd/rt-logmfd-vs/Makefile b/regtest/logmfd/rt-logmfd-vs/Makefile
new file mode 100644
index 0000000000000000000000000000000000000000..3703b27cea227aa053fb6d1d73f861e4384dbcee
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/Makefile
@@ -0,0 +1 @@
+include ../../scripts/test.make
diff --git a/regtest/logmfd/rt-logmfd-vs/config b/regtest/logmfd/rt-logmfd-vs/config
new file mode 100644
index 0000000000000000000000000000000000000000..fb67c7e879f8e91a6a8e1a18c060bb417133e050
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/config
@@ -0,0 +1,6 @@
+type=simplemd
+plumed_modules=logmfd
+arg="--plumed plumed.dat < in"
+extra_files="../input.xyz"
+
+
diff --git a/regtest/logmfd/rt-logmfd-vs/energies.dat b/regtest/logmfd/rt-logmfd-vs/energies.dat
new file mode 100644
index 0000000000000000000000000000000000000000..d05f94868c2e214533133ca6fe5e8a387f64b443
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/energies.dat
@@ -0,0 +1,500 @@
+10 0.050000 14.074354 -634.565052 1645.480219 1761.212867
+20 0.100000 10.695250 -562.668342 1169.962208 1413.264578
+30 0.150000 3.636492 -561.548268 27.563475 347.606562
+40 0.200000 0.993374 -559.931505 -399.004928 4.495983
+50 0.250000 5.327557 -557.997414 305.066739 803.236811
+60 0.300000 10.381703 -565.109304 1116.726507 1696.003234
+70 0.350000 9.640969 -546.546942 1015.290083 1629.584152
+80 0.400000 4.188741 -560.744310 117.831756 800.022646
+90 0.450000 1.005476 -562.466342 -399.579255 338.894277
+100 0.500000 3.344090 -545.268649 -3.526146 809.188838
+110 0.550000 7.884009 -552.147217 725.062318 1591.422430
+120 0.600000 8.374765 -557.751181 798.960706 1763.438893
+130 0.650000 4.769539 -557.928175 214.737063 1251.105628
+140 0.700000 1.369561 -552.547273 -330.678370 754.018358
+150 0.750000 1.852360 -545.347680 -245.265297 873.442944
+160 0.800000 5.066665 -544.766162 276.033556 1446.204026
+170 0.850000 6.990580 -548.230826 584.243063 1806.012723
+180 0.900000 4.979739 -535.892932 270.824742 1540.212267
+190 0.950000 1.860874 -549.426543 -247.965014 1074.384973
+200 1.000000 1.125472 -538.298843 -355.972404 1005.500856
+210 1.050000 4.399986 -539.623728 173.174011 1569.971604
+220 1.100000 6.614774 -528.964973 542.628360 1979.462876
+230 1.150000 5.398905 -529.140342 345.482217 1807.919450
+240 1.200000 2.184756 -522.578325 -168.647836 1327.386337
+250 1.250000 1.083038 -524.415526 -348.963341 1171.597167
+260 1.300000 2.800343 -504.129883 -50.474305 1514.904079
+270 1.350000 5.136950 -524.914882 307.271013 1906.529989
+280 1.400000 5.308149 -526.656459 333.263643 1951.892599
+290 1.450000 3.002048 -525.499468 -39.167665 1610.302534
+300 1.500000 1.085127 -516.628276 -340.837635 1343.574303
+310 1.550000 2.573578 -535.514023 -118.594397 1603.635282
+320 1.600000 4.822581 -541.562076 239.695984 2005.730273
+330 1.650000 5.041920 -530.419884 286.371163 2088.026743
+340 1.700000 2.989636 -513.438332 -29.117281 1804.682495
+350 1.750000 1.254419 -506.228211 -303.012355 1554.331807
+360 1.800000 1.477589 -505.679603 -266.310235 1622.227868
+370 1.850000 3.171201 -519.928765 -6.194152 1913.904008
+380 1.900000 4.240522 -514.627920 172.336659 2106.540577
+390 1.950000 3.594041 -509.432543 72.802062 2010.430214
+400 2.000000 1.952828 -518.428834 -202.070674 1782.594980
+410 2.050000 1.338280 -531.966938 -315.165627 1689.378377
+420 2.100000 2.409292 -518.122926 -127.817576 1906.394672
+430 2.150000 3.581500 -513.328858 66.874113 2115.554212
+440 2.200000 3.423129 -524.628548 29.918352 2098.197610
+450 2.250000 2.061895 -515.454798 -181.427781 1905.514275
+460 2.300000 1.148063 -509.241797 -323.255625 1779.143275
+470 2.350000 1.585297 -514.945629 -258.127479 1858.321564
+480 2.400000 2.683444 -506.448026 -71.730029 2054.349705
+490 2.450000 3.232274 -527.813280 -4.184864 2142.909730
+500 2.500000 2.429603 -517.370734 -123.774992 2047.647119
+510 2.550000 1.197470 -510.957513 -316.967371 1865.140195
+520 2.600000 1.462323 -506.271440 -269.375089 1918.866976
+530 2.650000 2.179344 -502.680168 -149.626509 2035.621381
+540 2.700000 2.513357 -499.650078 -92.486266 2116.148936
+550 2.750000 2.262403 -515.077288 -148.568053 2074.640881
+560 2.800000 1.534023 -494.867252 -246.355462 1980.572042
+570 2.850000 1.339022 -502.937396 -286.015814 1932.776953
+580 2.900000 1.567540 -495.391083 -241.449580 1989.496152
+590 2.950000 2.215378 -508.564117 -149.672819 2082.810131
+600 3.000000 2.230358 -485.807120 -124.489055 2115.932002
+610 3.050000 1.479591 -479.001654 -239.307856 1998.181165
+620 3.100000 1.324151 -493.095084 -278.582682 1968.907243
+630 3.150000 1.384125 -486.231865 -262.003633 1986.116822
+640 3.200000 1.700949 -499.992565 -224.438776 2034.669152
+650 3.250000 1.757933 -485.194591 -200.409521 2060.882920
+660 3.300000 1.748284 -510.287352 -227.065324 2037.083931
+670 3.350000 1.293111 -489.290239 -279.806289 1993.768147
+680 3.400000 1.217822 -495.897219 -298.610005 1987.360402
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+3900 19.500000 1.340715 -497.707246 -280.511462 2591.661002
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+3990 19.950000 1.298237 -502.183509 -291.869035 2611.891292
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+4010 20.050000 1.351673 -496.880396 -277.909427 2623.496367
+4020 20.100000 1.543254 -509.734291 -259.727185 2638.777407
+4030 20.150000 1.385668 -494.409979 -269.931713 2632.759497
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+4060 20.300000 1.479784 -518.019491 -278.294540 2619.387251
+4070 20.350000 1.398401 -491.295478 -264.754563 2635.974085
+4080 20.400000 1.399229 -496.035693 -269.360649 2637.792657
+4090 20.450000 1.297393 -493.096033 -282.918393 2627.799347
+4100 20.500000 1.233489 -487.961822 -288.136552 2618.795291
+4110 20.550000 1.452262 -496.135379 -260.868940 2649.523469
+4120 20.600000 1.570550 -498.030228 -243.601078 2669.909399
+4130 20.650000 1.616129 -513.169840 -251.356884 2661.779823
+4140 20.700000 1.381517 -498.255896 -274.450071 2639.094672
+4150 20.750000 1.385281 -498.375055 -273.959545 2633.454419
+4160 20.800000 1.532168 -514.872061 -266.660769 2645.875263
+4170 20.850000 1.570683 -507.293881 -252.843295 2663.534158
+4180 20.900000 1.450556 -495.893453 -260.903434 2669.748025
+4190 20.950000 1.440692 -508.858101 -275.465988 2651.171858
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+4220 21.100000 1.666359 -507.218683 -237.268462 2699.889233
+4230 21.150000 1.659256 -511.341717 -242.542314 2694.209238
+4240 21.200000 1.432590 -515.568102 -283.488479 2660.441544
+4250 21.250000 1.362808 -532.926905 -312.152009 2641.210565
+4260 21.300000 1.349698 -520.229727 -301.578617 2656.754608
+4270 21.350000 1.386207 -495.062740 -270.497206 2691.354153
+4280 21.400000 1.508993 -515.198929 -270.742144 2703.451437
+4290 21.450000 1.354967 -509.529385 -290.024761 2682.518425
+4300 21.500000 1.273948 -509.588485 -303.208835 2653.334182
+4310 21.550000 1.557191 -510.486548 -258.221537 2690.765458
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+4330 21.650000 1.790993 -519.502834 -229.361907 2730.266553
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+4370 21.850000 1.604051 -512.686913 -252.830685 2722.888012
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+4430 22.150000 1.736227 -499.783821 -218.515051 2771.066232
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diff --git a/regtest/logmfd/rt-logmfd-vs/in b/regtest/logmfd/rt-logmfd-vs/in
new file mode 100644
index 0000000000000000000000000000000000000000..8dd8cd686299c8d25dae4397657dcbc57f750a33
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/in
@@ -0,0 +1,10 @@
+inputfile input.xyz
+outputfile output.xyz
+temperature 1.2
+tstep 0.005
+friction 1
+forcecutoff 2.5
+listcutoff  3.0
+nstep 500
+nconfig 100 trajectory.xyz
+nstat   10 energies.dat
diff --git a/regtest/logmfd/rt-logmfd-vs/logmfd.out.reference b/regtest/logmfd/rt-logmfd-vs/logmfd.out.reference
new file mode 100644
index 0000000000000000000000000000000000000000..32347a003bdd56bd25d4830e33053744c56857ad
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/logmfd.out.reference
@@ -0,0 +1,11 @@
+# LogMFD
+# CVs : d
+# Mass for CV particles :    1000.000000000
+# Mass for thermostat   :   24943.386300000
+# 1:iter_md, 2:Flog, 3:2*Ekin/gkb[K], 4:eta, 5:Veta,
+# 6:d_fict(t), 7:d_vfict(t), 8:d_force(t),
+       1      11.31874011     300.00000000       0.00000000       0.00000000       1.52497168       0.04994335     -49.37805290 
+       2      12.11796798     300.00000000       0.00000000       0.00000000       1.54994335       0.04994335     -30.84486807 
+       3      12.64372631     300.00000000       0.00000000       0.00000000       1.57491503       0.04994335     -20.57601661 
+       4      12.62225551     300.00000000       0.00000000       0.00000000       1.59988671       0.04994335       0.86059445 
+       5      12.39455605     300.00000000       0.00000000       0.00000000       1.62485839       0.04994335       9.20815359 
diff --git a/regtest/logmfd/rt-logmfd-vs/plumed.dat b/regtest/logmfd/rt-logmfd-vs/plumed.dat
new file mode 100644
index 0000000000000000000000000000000000000000..76d367a4ff4be3386e961e51f69fb7c8c3a7e790
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/plumed.dat
@@ -0,0 +1,22 @@
+# LogMFD parameters VS
+
+d: DISTANCE ATOMS=1,2
+
+LOGMFD ...
+ LABEL=logmfd
+ ARG=d
+ KAPPA=50000.0
+ DELTA_T=0.5
+ INTERVAL=100
+ TEMP=300.0
+ FLOG=10.0
+ FICT=1.5
+ MFICT=1000
+ VFICT=0.00
+ ALPHA=4.0
+ THERMOSTAT=VS
+ FICT_MIN=0.0
+ FICT_MAX=10.0
+... LOGMFD
+
+PRINT ARG=d,logmfd.d_fict STRIDE=100 FILE=COLVAR
diff --git a/regtest/logmfd/rt-logmfd-vs/replica.out.reference b/regtest/logmfd/rt-logmfd-vs/replica.out.reference
new file mode 100644
index 0000000000000000000000000000000000000000..2974531ae72d84834478e302c1817beec520450b
--- /dev/null
+++ b/regtest/logmfd/rt-logmfd-vs/replica.out.reference
@@ -0,0 +1,8 @@
+# Replica No. 0 of 1.
+# 1:iter_md, 2:work, 3:weight,
+# 4:d(q)
+       1    1.233053e+00     1.000000e+00        1.49901244 
+       2    2.003301e+00     1.000000e+00        1.52435478 
+       3    2.517119e+00     1.000000e+00        1.54953183 
+       4    2.495628e+00     1.000000e+00        1.57493224 
+       5    2.265685e+00     1.000000e+00        1.60007087