ND_BOX nd_box_init nd_box_intersects nd_box_overlap nd_box_ratio_overlaps ND_DIMS ND_IBOX nd_increment ND_STATS nd_stats_value_index tpoint_compute_stats

ND_STATS typedef struct ND_STATS_T ND_STATS N-dimensional statistics structure. Well, actually four-dimensional, but set up to handle arbirary dimensions if necessary (really, we just want to get the 2,3,4-d cases into one shared piece of code).