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Short helpfile for action MULTI_RMSD
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The following arguments are compulsory: 

              REFERENCE - a file in pdb format containing the reference structure and 
                          the atoms involved in the CV. 
                   TYPE - ( default=SIMPLE ) the manner in which RMSD alignment is 
                          performed. Should be MULTI-OPTIMAL, MULTI-OPTIMAL-FAST, MULTI-SIMPLE 
                          or MULTI-DRMSD. 

In addition you may use the following options: 

                SQUARED - ( default=off ) This should be set if you want the mean 
                          squared displacement instead of the root mean squared displacement 
                  NOPBC - ( default=off ) don't use periodic boundary conditions 

