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Short helpfile for action CHARGE_SCALAR
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The input trajectory can be in any of the following formats: 

                   ATOM - the atom number. For more information on how to specify 
                          lists of atoms see \ref Group 
                  ATOMS - the atom numbers that you would like to store the masses 
                          and charges of. For more information on how to specify lists of 
                          atoms see \ref Group 

The following options are available

  NUMERICAL_DERIVATIVES - ( default=off ) calculate the derivatives for these 
                          quantities numerically 
                  NOPBC - ( default=off ) ignore the periodic boundary conditions 
                          when calculating distances 

