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+	Interactive Keystroke Commands
+
+?	Print options
+f	Fit data and graph fit with the current graph type (g,x,r,y,s)
+g	Graph the data and the current fit
+x,r	Graph the x(in) fit residuals versus x(ref) and y(ref) respectively
+y,s	Graph the y(in) fit residuals versus x(ref) and y(ref) respectively
+d,u	Delete or undelete the data point nearest the cursor
+o	Overplot the next graph
+c	Toggle the line of constant x(ref), y(ref) plotting option
+t       Plot a line of constant x(ref), y(ref) through nearest data point	
+l	Print xshift, yshift, xscale, yscale, xrotate, yrotate
+q	Exit the interactive surface fitting code
+
+	Interactive Colon Commands
+
+The parameters are listed or set with the following commands which may be
+abbreviated.  To list the value of a parameter type the command alone.
+
+:show	 	     List parameters
+:fit 	  [value]    Fit geometry (shift,xyscale,rotate,rscale,rxyscale,general)
+:function [value]    Fitting function (chebyshev,legendre,polynomial)
+:order	  [value]    X and Y fitting orders in x and y
+:xxorder  [value]    X fitting function order in x
+:xyorder  [value]    X fitting function order in y
+:yxorder  [value]    Y fitting function order in x
+:yyorder  [value]    Y fitting function order in y
+:xxterms  [n/h/f]    X fit cross terms type
+:yxterms  [n/h/f]    Y fit cross terms type
+:maxiter  [value]    Maximum number of rejection iterations
+:reject   [value]    K-sigma rejection threshold