Based on the screenshot provided, it looks like the Z value for the 3D surface (top map) may be the depth or elevation of the reading. If this is the case, instructions for determining the Z value at a specific location can be found in the article How can I find the Z value of a known XY point in Surfer? However, please note that Golden Software does not develop or support Lorenz detectors or the scripts provided with these instruments. Please contact the manufacturer for questions about data interpretation.
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