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+ gsaccum - Accumulate point into data set
+ gsacpts - Accumulate points into a data set
+ gsadd - Add two surfaces
+ gscoeff - Get coefficients
+ gscopy - Copy one surface to another
+ gsder - Evaluate the derivatives of a surface
+ gserrors - Calculate chi-square and errors in coefficients
+ gseval - Evaluate surface at x and y
+ gsfit - Fit surface
+ gsfree - Free space allocated by gsinit
+ gsinit - Make ready to fit a surface; set up parameters of fit
+ gsrefit - Refit surface, same x, y and weight, different z
+ gsreject - Reject point from data set
+ gsrestore - Restore surface parameters and coefficients
+ gssave - Save surface parameters and coefficients
+ gssolve - Solve matrix for coefficients
+ gsstati - Get integer parameter
+ gsstatr - Get real parameter
+ gssub - Subtract one surface from another
+ gsvector - Evaluate surface at an array of x and y
+ gszero - Zero arrays for new fit