input,f,a,,,,Input text file containing data to be fit
image,f,h,,,,Output surface image (optional)
coordinates,f,h,"",,,Text file of coordinates to be evaluated (optional)
fit,f,h,"",,,"Text file for output evaluated fit
"
function,s,h,"polynomial","chebyshev|legendre|polynomial",,Surface function
xorder,i,h,2,1,,X order of surface
yorder,i,h,2,1,,Y order of surface
xterms,s,h,"full","|none|full|half|",,Cross-terms type
weighting,s,h,"user","uniform|user|statistical|instrumental",,Weighting type
xmin,r,h,INDEF,,,Minimum X value over which surface is defined
xmax,r,h,INDEF,,,Maximum X value over which surface is defined
ymin,r,h,INDEF,,,Minimum Y value over which surface is defined
ymax,r,h,INDEF,,,Maximum Y value over which surface is defined
zmin,r,h,INDEF,,,Minimum Z value to include in fit
zmax,r,h,INDEF,,,Maximum Z value to include in fit
ncols,i,h,100,1,,Number of columns in output image
nlines,i,h,100,1,,Number of lines in output image