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GMT is a free collection of ~60 UNIX tools that allow users to
manipulate (x,y) and (x,y,z) data sets (including filtering, trend
fitting, gridding, projecting, etc.) and produce Encapsulated
PostScript File (EPS) illustrations ranging from simple x-y plots
through contour maps to artificially illuminated surfaces and 3-D
perspective views in black and white, gray tone, hachure patterns, and
24-bit color. GMT supports 25 common map projections plus linear, log,
and power scaling, and comes with support data such as coastlines,
rivers, and political boundaries.
The package also includes 39 supplemental programs, html documentation,
and examples.
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