If you're using a printer host (like Repetier Host, Pronterface or even Octoprint) you can print out the current mesh with "G29 T". Any points that were not probed will show as ".". Then the recommended procedure is to run "G29 P3" so UBL can interpolate/extrapolate the missing values. It might take more than one run of "G29 P3" to fill in all the unprobed points. Then print out a mesh validation pattern with "G26" and fine-tune the mesh with "G29 P4" as needed.
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