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With Postscript terminals, it's possible to write greek letters and some basic mathematical symbols in labels and titles. The syntax to be used is described here.

Greek letters and the integral symbol.

draw2d(
  filled_func = 0,
  fill_color  = cyan,
  explicit(x^2-x+5, x, 1, 4),
  filled_func = false,
  explicit(x^2-x+5, x, -1, 5),
  label(["A = {/Symbol=30 \\362@_{/=9.6 1}^{/=12 4}} ({/Symbol a} x^2 + {/Symbol b} x +{/Symbol g}) d x",1,17]),
  yrange      = [-1,30],
  grid        = true,
  terminal    = eps ) $

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