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Disabling contour lines at a polygon boundary

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You can use the Geological Utilities Grid / Filters / Polygon Clip tool to filter the nodes of a grid model (.GRD) that lie inside or outside a polygonal boundary that you define. If you set the replacement value to the null value -1.0e27 and if you turn on the Contour Lines / Intervals / Regular / Skip Low Value option, setting the Lower Threshold value to the same value, then the contour lines will simply end at the polygon boundary.

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