COLOR = expr;                 Set trace color

The COLOR control sets subsequent trace colors to the color that
corresponds to the value of 'expr'.  The colors are taken from the
Trace Colors form and correspond to 'expr' as follows:

     'expr'      Color
     ---------   -------------------------------
     0-.99...    Nominal colors selected by DAN
     1-1.99...   Trace 1
     2-2.99...   Trace 2
     .           .
     .           .
     .           .
     16-16.99... Trace 16

