List keypoints that lie on a parametric degeneracy on volumes from NV1 to NV2 (defaults to NV1) in steps of NINC (defaults to 1). If NV1 = ALL (default), NV2 and NINC will be ignored and keypoints on all selected volumes (VSEL) will be listed. If NV1 = P, graphical picking is enabled and all remaining command fields are ignored (valid only in the GUI). You may also substitute a component name for NV1 (ignore NV2 and NINC).