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+1.	DTOI INTERACTIVE CURVE FITTING OPTIONS 
+
+?	Print options
+a	Add point at the cursor position to sample (from HD curve only)
+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  Independent variable	y  Dependent variable
+	    f  Fitted value		r  Residual (y - f)
+	    d  Ratio (y / f)		n  Nonlinear part of y
+	    u  Density above fog
+o	Overplot the next graph
+q	Exit the interactive curve fitting.  Carriage return will also exit.
+r	Redraw graph
+u	Undelete the deleted 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	Change the weight of the point nearest the cursor
+
+
+2. 	DTOI 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
+:errors [file]		Print the errors of the fit (default STDOUT)
+:reset			Return to original conditions (x, y, wts and npts)
+:ebars [errors/weights]	Error bars can indicate either errors or weights
+:function [value]	Fitting function (power, cheby, legen, spline3, spline1)
+:transform [value]	Set the transform type (none, logo, k50, k75)
+:fog [value]		Change the fog level (or ":fog reset")
+:order [value]		Fitting function order
+:quit			Terminate HDFIT without updating database
+
+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 cursor mode
+
+
+3.	DTOI INTERACTIVE CURVE FITTING GRAPH KEYS
+
+The graph keys h, i, j, k, and l indicate the following types of graphs:
+h	h = (x,y)  transformed density vs. log exposure
+i	i = (y,x)  log exposrue vs. transformed density
+j	j = (x,r)  transformed density vs. residuals
+k	k = (x,d)  transformed density vs. the y(data)/y(fit) ratio
+l	l = (y,u)  log exposure vs. density above fog (HD Curve)
+
+The graph keys may be redefined to put any combination of axes type 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)
+x  Indepedent variable
+y  Dependent variable (data being fit)
+u  User - which for the DTOI package is density above fog