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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 to (or specify number of nodes) to achieve a smoothing effect. If value is 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.
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