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+1. INTERACTIVE CURVE FITTING CURSOR KEYS
+
+?	Print options
+a	Add point to constrain fit (points are not added to feature list)
+c	Print the coordinates and fit of point nearest the cursor
+d	Delete data point nearest the cursor
+f	Fit the data and redraw or overplot
+g	Redefine graph keys.  Any of the following data types may be along
+	either axis.
+	    x  Pixel coordinate	  y  User coordinate	f  Fitted value
+	    r  Residual=(y - f)   d  Ratio=(y / f)	n  Nonlinear part of y
+	    v  Radial velocity=(y - f) / y * 30000
+h-l	Graph keys.  Defaults are h=(y,x), i=(y,v), j=(y,r), k=(y,d), l=(y,n)
+o	Overplot the next graph
+q	Exit the interactive curve fitting.  Carriage return will also exit.
+r	Redraw graph
+s	Set sample range with the cursor
+t	Initialize the sample range to all points
+u	Undelete the deleted point nearest the cursor
+v	Change the weight of the point nearest the cursor
+w	Set the graph window.  For help type 'w' followed by '?'.
+x	Change the x value of the point nearest the cursor
+y	Change the y value of the point nearest the cursor
+z	Delete sample region nearest cursor
+I	Interrupt task immediately
+
+
+2. INTERACTIVE CURVE FITTING 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 [file]		Show the values of all the parameters
+:vshow [file]		Show the values of all the parameters verbosely
+:xyshow [file]		Show the x, y, y fit, and weight data values
+:evaluate <value>	Print the fit at the specified value
+:errors [file]		Print the errors of the fit (default STDOUT)
+:function [value]	Fitting function (chebyshev, legendre, spline3, spline1)
+:grow [value]		Rejection growing radius
+:naverage [value]	Sample averaging or medianing window
+:order [value]		Fitting function order
+:low_reject [value]	Low rejection threshold
+:high_reject [value]	High rejection threshold
+:niterate [value]	Number of rejection iterations
+:sample [value]		Sample ranges
+:markrej [value]	Mark rejected points?
+
+Additional commands are available for setting graph formats and manipulating
+the graphics.  Use the following commands for help.
+
+:/help			Print help for graph formatting option
+:.help			Print help for general graphics options
+
+
+3. INTERACTIVE CURVE FITTING GRAPH KEYS
+
+The graph keys are h, i, j, k, and l.  The graph keys may be redefined to
+put any combination of axes types along either graph axis with the 'g' key.
+To define a graph key select the desired key to redefine and then specify
+the axes types for the horizontal and vertical axes by a pair of comma
+separated types from the following:
+
+d  Ratio = (y / f)
+f  Fitted values
+r  Residuals of fit = (y - f)
+n  Nonlinear part of data (linear component of fit subtracted)
+v  Radial velocity = 30000 * (y - f) / y
+x  Pixel coordinates
+y  User coordinates