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How is the default R-squared parameter calculated for Surfer's Radial Basis gridding method?

The default R-squared parameter for Surfer's Radial Basic Function gridding method is calculated as follows:
(Length of Diagonal of the data extent)2 / (25 * number of data points)

This value was chosen for robustness because it works with most data sets.

 

Updated September 18, 2017

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