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Draw a contour map on surfer 136/2/2023 ![]() To do so, you will create a grid file defining the upper and lower surfaces, find the difference in the elevations with the Grid | Math command, and create a contour map. If you have data defining the elevation of the top and bottom surfaces, you can use Surfer 12 mapping software to create an isopach map. Isopach maps are often used in geology to illustrate thickness variations between two layers, such as the top and bottom of a coal seam or stratigraphic layer.
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