10 10 50 Plot
  This menu function allows to save the current 
graphical image of the plot in the LaTeX format. 
We use Axodraw package to draw axes and lines. 
The image can be refined by means of the self-explanatory
Axodraw commands in the output LaTeX source file.
Choose the picture and symbol size before the
generation of LaTeX source and see the output file 
name displayed on the screen.