Hello, The "fit sphere" function works well to flatten a sphere and measure the volume of debris over its surface after a friction test. It is however necessary to proceed in two steps: Fit the sphere and calculate the difference between the original data and the fitted sphere (multidata arithmetic). As the difference is anyway displayed in the preview window, I was wandering if it is, or if it would be, possible to get it directly, without going through the subtraction operation. Thanks in advance, Regards, Jean
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