vice.toolkit.interpolation.interp_scheme_2d.zcoords
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Type : ``list`` [elements are of type ``list``, storing real numbers]

The z-coordinates on which the function is sampled. A 2-D list, this
attribute stores a value at each of the (x, y) coordinates on which
a z-coordinate is known. The first axis corresponds to the x-coordinate,
and the second the y-coordinate.