| This is part of the colvar module | 
An alias to the MULTI-RMSD function.
| REFERENCE | a file in pdb format containing the reference structure and the atoms involved in the CV. | 
| TYPE | ( default=MULTI-SIMPLE ) the manner in which RMSD alignment is performed. Should be MULTI-OPTIMAL, MULTI-OPTIMAL-FAST, MULTI-SIMPLE or MULTI-DRMSD. | 
| NUMERICAL_DERIVATIVES | ( default=off ) calculate the derivatives for these quantities numerically | 
| SQUARED | ( default=off ) This should be setted if you want MSD instead of RMSD  | 
Just replace MULTI-RMSD with MULTI_RMSD
MULTI_RMSD REFERENCE=file.pdb TYPE=MULTI-DRMSD