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Why do I get the"Insufficient Data" error when loading a data file for gridding or variogram analysis?
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The most common cause of the "Insufficient Data" error is using an Excel XLSX or XLS data file where the numbers are formatted as text instead of numeric values. You can use Excel to change the format to numeric, or open the file in the Surfer worksheet and save it as a DAT file with the text delimiter set to "None". 
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