Dear Paul,
Just a few more thoughts:
- If your whole document is black-and-white (if you switch colors off
globally), the plot will turn out black-and-white anyway (actually it
will be different shades of gray).
- You can always use something like
plot pi lt 1 lc 0, 2*pi lt 2 lc 0
or
lc rgb "black" (if I'm not mistaken about the syntax)
or
set style line 1 lt 1 lc 0
set style line 2 lt 2 lc 0
plot sin(x) ls 1, cos(x) ls 2, ...
Mojca
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