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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