I hope this makes sense then at the right the cross section is drawn.
Might just be shadow that makes it look like that, though.
Ah right, I see what you mean. I think it might just be the shadow - but I'll double check when I get home, I'm pretty sure its correct.
Also, the RS arches are slightly wider than the standard ones like in your pic - this makes the angle that the two surfaces meet slightly tighter (and therefore get a more pronounced shadow).
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