[whswhs]

In any case, I was able to rewrite Infravision because there are multiple bands of IR that can get through the atmosphere to different degrees, and that have different optical properties; the conventional GURPS treatment somewhat conflates the properties of very near IR with those of IR emitted by things like mammal bodies. UV has only one narrow band just above violet; higher frequencies don't get through the atmosphere—that's why they're called "vacuum ultraviolet." So I couldn't very well say "this is the version of the advantage that's limited to this narrower set of frequencies," because that narrower set of frequencies is what Ultravision is.