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Short helpfile for action POSITION
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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 use the positions 
                          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 
         WHOLEMOLECULES - ( default=off ) if this is a vector of positions do you 
                          want to make the positions into a whole before 
      SCALED_COMPONENTS - ( default=off ) calculate the a, b and c scaled components 
                          of the position separately and store them as label.a, label.b 
                          and label.c 

