1r1:   RMSD REFERENCE=ref.pdb  TYPE=OPTIMAL-FAST NOPBC
2r1x:   RMSD REFERENCE=refx.pdb  TYPE=OPTIMAL-FAST NOPBC
3r2:   RMSD REFERENCE=ref2.pdb  TYPE=OPTIMAL-FAST NOPBC
4#num-r2:   RMSD REFERENCE=ref2.pdb  TYPE=OPTIMAL-FAST NUMERICAL_DERIVATIVES
5
6DUMPDERIVATIVES FILE=deriv ARG=r1,r1x FMT=%12.8f
7#DUMPDERIVATIVES FILE=check ARG=r2,num-r2 FMT=%12.8f
8
9PRINT ...
10  STRIDE=1
11  ARG=*
12  FILE=COLVAR FMT=%12.8f
13... PRINT
14
15ENDPLUMED
16
17