The topography, ridges or mountains or so, used on the pages with examples has one of the following profiles:
The full cosine (blue line; like the one sketched on the page about the effect of a bottom topography) is used for:
The half cosine (red line) is used for:
The full cosine topography has smooth derivatives everywhere.
The half cosine has a discontinuity in the derivatives at the foot of the topography.
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