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When you say "filling a curve with a pattern instead of a color, do you mean like this http://docs.ggplot2.org/0.9.3.1/aes_linetype_size_shape.html?

He means hatches, similar to how the hatch demo [1] fills in boxplots

No, that's a line. I mean filling the curve, as in 2D, i.e. instead of using a solid color, using a pattern.