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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
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