When measuring square slots, it is important that hits are taken clockwise or counterclockwise in order around the slot. For example, a square slot with five hits should have two hits on the first side, and one hit on the remaining three sides in order around the slot.
If there are six hits, there should be two on the first side, one on the next, two on the next, and one on the last. The hits should be strictly clockwise or counterclockwise.