3 ms·
"In olden days, an 'em' was the width of an 'M', but this is no longer true; ems are simply arbitrary units that come with a font" - the TeXbook, p60
by thisrod 15y ago
"In olden days, an 'em' was the width of an 'M', but this is no longer true; ems are simply arbitrary units that come with a font" - the TeXbook, p60