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Will use smoothing of cube at end of gridding.
exc [value] | [nod 'number_of_nodes']
Exclude points at grid nodes closer than value (or specify number of nodes) to achieve a smoothing effect. If value or nod is omitted only the grid node to be smoothed is excluded and the 8 remaining grid nodes in the 3x3 grid node pattern (default) are used to evaluate the grid node using the parabolic interpolator unless the mav argument is used. grp exc is often run as an extra smoothing step after the gridding.
exc ... neb ['number_of_border_nodes']
Smoothes like grp exc but will not smooth at the border (no exclude points at border). Default is 1 node, but neb 'number_of_border_nodes' will set the no_smoothing_zone higher. Thus with this argument one can extract a part of a grid and smooth it with grp exc neb and insert it into the grid (using rep lo grid) without having any unpleasant transition zone where the grid is inserted.
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