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plsurf3d(x, y, z, XPTS, YPTS, MAG_COLOR, NULL, 0);
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} else if (ifshade == 2) { /* magnitude colored plot with faceted squares */
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plsurf3d(x, y, z, XPTS, YPTS, MAG_COLOR | FACETED, NULL, 0);
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plsurf3d(x, y, z, XPTS, YPTS, MAG_COLOR | SURF_CONT | BASE_CONT, clevel, nlevel);