This function is an internal helper function, that adds diagonally related points to the computation. In paticular if a point (v1,v2) is present, then this function will add the three points (v1,v1), (v2,v2) and (v2,v1).
The result of the function 'LG_select_points'.
An extended version of the array from
be returned, with column names "v1" and "v2" and row names
which identifies the points of interest (to be used in the
argument grids). The returned array has been screened for
duplicates, and only contains unique points.
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