DiaGI. Command usage.
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The following keys and mouse buttons are bound to DiaGi commands:

<Left/Mouse>    Inquire of the coordinate of the point where cursor is pointed;
<Middle/Mouse>  Changes of the boundary of the plotting box nearest to cursor;
<Right/Mouse><Right/Mouse>  Terminate execution DiaGI;
            B   Change error bar style for the current function (colour);
            C   Change the current function (colour);
            E   Terminate execution DiaGI and come back to the calling program;
            I   Set up initial plotting parameters;
            L   Change line style for the current function (colour);
            M   Set minimal plotting box to include all points;
            O   Change overplot mode;
            P   Change point style for the current function (colour);
            Q   Terminate execution DiaGI and come back to the calling program;
            R   Redraw the plot;
            S   Save current plot in file;
            T   Change the title of the plot;
            U   Change label of arguments units;
            V   View plotting values for the current function (colour);
            W   Change line width for the current function (colour);
            X   Terminate execution DiaGI and come back to the calling program;
     <CNTRL/P>  Printing the plot;
            ?   Display help information.
Enter          
               1 -- to read DiaGI User guide; 
               2 -- to read verbose descriptions of DiaGI command;
any other symbol -- to return to the plot.