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Variables

Any variable can be plot if it resolves as a function of the frequency
variable `fr`. That is, pf = 1 / (y + x);
x = 10 * fr;
plot: pf;

is wrong, but pf = 1 / (y + x);
x = 10 * fr;
y = 1;
plot: pf;

is okay.

2009-06-03