
 color ARRAY
 color CNAME | CINDEX                  Set colour to C

    color ARRAY sets the markers' color specified by ARRAY, which is read 
    from data file.


    COLOR CNAME sets the color to be CNAME.  CNAME must be one of
    "white", "black", "green", "blue", "red", "magenta", "yellow", or
    "cyan".  The default in X-windows is black on white.

    COLOR CINDEX is another way of selecting the same color as are
    available with COLOR CNAME, where the CINDEX is an index into the
    array [white, black, green, blue, red, magenta, yellow, cyan], so
    "COLOR 1" is the same as "COLOR white".

