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Short helpfile for action EVALUATE_FUNCTION_FROM_GRID
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The following arguments are compulsory: 

                   GRID - the name of the grid that we are using to evaluate the 
                          function 
     INTERPOLATION_TYPE - ( default=spline ) the method to use for interpolation. Can 
                          be spline, linear, ceiling or floor. 

In addition you may use the following options: 

ZERO_OUTSIDE_GRID_RANGE - ( default=off ) if we are asked to evaluate the function 
                          for a number that is outside the range of the grid set it to 
                          zero 
                    ARG - the arguments that you would like to use when evaluating 
                          the function. If not specified these are determined from the 
                          names of the grid dimensions 


