Graph legend

If LEGENDON is set true, i.e., non-zero, a legend entry is drawn into a legend frame box. A legend entry consists of a short line segment, with or without plotting symbol(s), and a string. The legend entry is drawn when the GRAPH command is entered. The string portion of the legend entry is expected as the first parameter of the GRAPH command. For example:

 GRAPH 'legend entry' X Y
 

If LEGENDON is false, i.e., zero, a string entered as a first parameter with the GRAPH command will be ignored.

  Plotting symbols
  Axis scaling