C-SAR,
When you saw this bit for real, did it look like the angle of cuts was steeply downhill?
I can't say. I could not approach the cactus more than you can see in the pictures. The picture is squint because I had my camera just out of my pocket "shooting from the hip" for obvious reasons, so I could not be too precise. I know that this "distorsion" inserts optical errors... unfortunately this is the best I could do, given the circumstances. If anything, it looks as if the left cuts are a little lower than the right ones... but without close examination of the cuts and proper measurements it is hard to add any other factual information.
C-SAR