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

                  ATOMS - the group of atoms that you are calculating the SASA for. 
                          For more information on how to specify lists of atoms see \ref 
                          Group 

The following arguments are compulsory: 

                   TYPE - ( default=TOTAL ) The type of calculation you want to 
                          perform. Can be TOTAL or TRANSFER 
              NL_STRIDE - The frequency with which the neighbor list for the 
                          calculation of SASA is updated. 

In addition you may use the following options: 

  NUMERICAL_DERIVATIVES - ( default=off ) calculate the derivatives for these 
                          quantities numerically 
                  NOPBC - ( default=off ) ignore the periodic boundary conditions 
                          when calculating distances 
             DELTAGFILE - a file containing the free energy of transfer values for 
                          backbone and sidechains atoms. Necessary only if TYPE = TRANSFER. If 
                          TYPE = TRANSFER and no DELTAGFILE is provided, the free energy 
                          values are those describing the effect of temperature, and are 
                          computed using the temperature value passed by the MD engine 
               APPROACH - either approach 2 or 3. Necessary only if TYPE = TRANSFER 
                          and no DELTAGFILE is provided. If TYPE = TRANSFER and no 
                          DELTAGFILE is provided, the free energy values are those describing 
                          the effect of temperature, and the program must know if 
                          approach 2 or 3 (as described in Arsiccio and Shea, Protein Cold 
                          Denaturation in Implicit Solvent Simulations: A Transfer Free Energy 
                          Approach, J. Phys. Chem. B, 2021) needs to be used to compute them 


