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+1. INTERACTIVE NONLINEAR LEAST SQUARES FITTING CURSOR OPTIONS
+
+?       Print options
+c       Print coordinates and fit of point nearest the cursor
+d       Delete point nearest the cursor
+f       Do the fit and redraw or overplot the graph
+g       Redefine graph keys.  The following data types may be along
+        either axis.
+            function    Dependent variable, or function
+            fit         Fitted value
+            residuals   Residuals (function - fit)
+            ratio       Ratio (function / fit)
+            nonlinear   Nonlinear component of function
+            var n       Independent variable number "n"
+            identifier  Independent variable "identifier" (if defined)
+            user n      User defined plot function (if defined)
+h-l     Graph keys.  The defaults are the following.
+	    h=(function, fit)
+	    i=(function, residual)
+            j=(function, ratio)
+	    k=(var 1, residual)
+	    l=(user 1, user 2)
+o       Overplot the next graph
+q       Exit interactive curve fitting
+r       Redraw graph
+t	Overplot fit
+u       Undelete the deleted point nearest the cursor
+w       Set graph window.
+	    For help type 'w' followed by '?' after the prompt.
+I       Interrupt task immediately
+
+
+2. INTERACTIVE NONLINEAR LEAST SQUARES 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]               Print the values of the task fitting parameters
+:variables [file]	   Print the variable names, min and max values
+:data [file]		   Print the values of all the variables
+:errors [file]             Print an error analysis of the fit
+:results [file]		   Print the results of the fit
+:vshow [file]              Print an error analysis and results of the fit
+:page file		   Page through a file
+:const [param] [value]     Change parameter to constant parameter
+:fit [param] [value]       Change parameter to fitting parameter
+:tolerance [value]	   Show/set the convergence criteria
+:maxiter [value]	   Show/set the maximum number of fitting iterations
+:nreject [value]           Show/set the maximum number of rejection iterations
+:low_reject [value]        Show/set the low rejection threshold
+:high_reject [value]       Show/set the high rejection threshold
+:grow [value]              Show/set the rejection growing radius
+
+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 NONLINEAR LEAST SQUARES 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 (they may be abreviated up to three
+characters, except for 'identifier'):
+
+function    Dependent variable
+fit         Fitted value
+ratio       Ratio (function / fit)
+residuuals  Residuals of fit (function - fit)
+nonlinear   Nonlinear part of data (linear component of fit subtracted)
+var [n]     Indepedent variable number "n"
+user [n]    User defined plot equation "n" (if defined)
+identifier  Independent variable named "identifier" (if defined)