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+	INTERACTIVE SURFACE FITTING
+
+?  List commands
+c  Print data values for point nearest the cursor
+d  Delete the point or set of points with constant x, y, or z
+	nearest the cursor (p, x, y, z,)
+f  Fit surface
+l  Graph the last set of points (in zoom mode)
+n  Graph the next set of points (in zoom mode)
+p  Graph all features
+q  Quit
+r  Redraw a graph
+u  Undelete the point or set of points with constant x, y, or z
+	nearest the cursor (p, x, y, z,)
+w  Window the graph.  Type '?' to the "window:" prompt for more help.
+x  Select data for the x axis (x, y, z, s, r)
+y  Select data for the y axis (x, y, z, s, r)
+z  Zoom on the set of points with constant x, y, or z (x, y, z)
+   Unzoom with p
+I  Interrupt task immediately
+
+:corners	List the surface fit at the corners of the image
+:function type	Set the function for the fitted surface (chebyshev, legendre)
+:show		Show the fitting parameters
+:xorder value	Set the x order  for the fitted surface
+:yorder value	Set the y order  for the fitted surface
+
+:/help		Additional graph formatting commands
+:.help		Additional general graph commands