| -mat_coloring_type | - the type of coloring algorithm used
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| -mat_coloring_maxcolors | - the maximum number of relevant colors, all nodes not in a color are in maxcolors+1
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| -mat_coloring_distance | - compute a distance 1,2,... coloring.
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| -mat_coloring_view | - print information about the coloring and the produced index sets
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| -snes_fd_color | - instruct SNES to using coloring and then MatFDColoring to compute the Jacobians
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| -snes_fd_color_use_mat | - instruct SNES to color the matrix directly instead of the DM from which the matrix comes (the default)
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