Compare with 3, 9 and 9, 3. If m1 = 3 and m2 = 9, it will have more stipples for light area and fewer stipples for dark area. If m1 = 9 and m2 = 3, it will have more stipples for dark area and fewer stipples for light area. I think m1 and m2 can adjust the number of stipples for light area and dark area respectively. It also means if we want a more precise density control, we have to test the content of the image such as histogram.
m1, m2
3, 3 
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