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Generic for extractign the 'z values' from an object.
zvals(obj, ...)
an object
additional arguments
the zvals method
xvals, yvals, xvals.default, yvals.default, zvals.default, xvals.fromXYZ, yvals.fromXYZ, zvals.fromXYZ, xvals.SpatialGridDataFrame, yvals.SpatialGridDataFrame, zvals.SpatialGridDataFrame