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I am reading James Felici's The Complete Manual of Typography and at one point he talks about the missuse of Times. He goes into comparing the length of different lines of type made up of 26 letters —from A to Z— to show that Times is a very condensed type. What I don't understand is that he says that the average length of a line of type should be around 13 em(s). I though em(s) was (were) a relative mesure.