grdcontour: Check that grd has at least 2 rows/columns before trying to contour it.#9062
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…to contour it. Fix the error reported in forum post https://forum.generic-mapping-tools.org/t/grdcont/6422/2
joa-quim
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seisman
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Jun 6, 2026
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Fix the error reported in forum post https://forum.generic-mapping-tools.org/t/grdcont/6422/2