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Short helpfile for action TD_CUSTOM
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The following arguments are compulsory: 

               FUNCTION - The function you wish to use for the target distribution 
                          where you should use the variables _s1_,_s2_,... 

In addition you may use the following options: 

          SHIFT_TO_ZERO - ( default=off ) Shift the minimum value of the target 
                          distribution to zero. This can for example be used to avoid negative 
                          values in the target distribution. If this option is active the 
                          distribution will be automatically normalized. 
    WELLTEMPERED_FACTOR - Broaden the target distribution such that it is taken as 
                          [p(s)]^(1/\f$\gamma\f$) where \f$\gamma\f$ is the well tempered factor given here. 


