Example 17. It is often difficult to blend two different gridded
data sets on one map. A solution is to use coastline clipping.
Here, a geoid grid is imaged in color, before pscoast is used to
initiate clipping, followed by a gray-shaded topography. Note that
both images fill the entire map, but the coastline clipping only
lets the images show where we want them to be valid.
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