... mode1.1
For historical reasons, the GMT Default is Landscape, see gmtdefaults  to change this.
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... plots1.2
ensures that boundary annotations do not fall off the page
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... database1.3
Wessel and Smith [1996]
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... inch)2.1
PostScript definition. In the typesetting industry a slighly different definition of point (1/72.27 inch) is used.
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...3.1
The -A option is necessary for geographic grids since x_inc shrinks with latitude. Rule of thumb: set aspect = cosine of the average latitude.
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Paul Wessel
1999-12-03