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4 -- Dip-azimuth corresponding to figure 2.
color represents the azimuth, which refers to the down-dip
direction and is therefore perpendicular to geologic strike.
Blue is north, green is east, yellow is south, and red is west.
The shading of the color represents the dip, with more shading
signifying steeper dips. Dip-azimuth presents the same
information as shaded relief, but is less intuitive.
courtesy of Arthur Barnes