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The skew is
defined as one minus the ratio of the shorter diagonal over the longer
diagonal. Thus, 0 is perfectly rectangular, and 1 represents maximum
skewness.

Eriksson Skewness
This is an empirical criterion, obtained for a hexahedral element by dividing the volume of the closest parallelepiped by the product of its edges. It measures the shear of the parallelepiped closest to the current element using least squares approximation. The default range of values is 0¨C1. Generally acceptable elements have skewness ranging from 0.5 to 1.

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