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I've never heard of "EF" being used to denote degrees Fahrenheit. Conventionally it's "°F" (degree sign, capital F). The linked .pdf doesn't seem to contain a reference to "EF" either, but it does use "EF" (middle dot, capital F). And guess what: it shows up just like "EF" when pasted into Wikipedia's edit boxes—it's a character display issue. (The original editor, Mikael Häggström possibly saw the same behaviour within his .pdf reader, and added it erroneously.) I'd originally tagged it with {{verify source}}, but given this discovery, I'll just edit it out. TheFeds 06:09, 11 December 2008 (UTC)[reply]