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How are the Z Mean Square and Z Root Mean Square in Surfer's gridding report calculated?

The Z Mean Square is the sum of the squares of the Z values of the grid nodes divided by the total number of nodes.

The Z Root Mean Square is the square root of the Z Mean Square.

Additional information about the various grid report statistics can be found in the Reports topic of Surfer's help.

Updated October 16, 2018

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