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.in 5means "indent 5 ems" because.indefaults to scaling all numbers as ems. (See "man 7 groff".) The\n(.iregister returns the indent in "units", not "ems", and that's the value we saved. So when we need to restore its value as an argument to.inwe must appenduto the number or else the value will be scaled up by.into ems (and be huge).