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Short helpfile for action PUT
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The following arguments are compulsory: 

                  SHAPE - ( default=0 ) the shape of the value that is being passed 
                          to PLUMED 
                   UNIT - the unit of the quantity that is being passed to PLUMED 
                          through this value. Can be either number, energy, time, length, 
                          mass or charge 
             FORCE_UNIT - ( default=default ) the units to use for the force 
               PERIODIC - if the value being passed to plumed is periodic then you 
                          should specify the periodicity of the function. If the value is 
                          not periodic you must state this using PERIODIC=NO. Positions 
                          are passed with PERIODIC=NO even though special methods are 
                          used to deal with pbc 

In addition you may use the following options: 

  NUMERICAL_DERIVATIVES - ( default=off ) calculate the derivatives for these 
                          quantities numerically 
               CONSTANT - ( default=off ) does this quantity not depend on time 
           FROM_DOMAINS - ( default=off ) is this quantity passed through the domain 
                          decomposition object 
                MUTABLE - ( default=off ) can plumed change the value of the pointer 
                          that is passed from the MD code 
                   ROLE - Get the role this value plays in the code can be x/y/z/m/q 
                          to signify that this is x, y, z positions of atoms or masses 
                          or charges of atoms 


