Fig. 8
Grid for testing curvilinear and overlapping routines. An annulus is superimposed on a Cartesian grid and used to replace part of that grid. The Cartesian grid has its vertices at (± 0.5, ± 0.5), a resolution of 400 × 400, and the annulus resolution matches that of the Cartesian grid at the inner circumference. We only show every fourth gridline in this plot for clarity.
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