Unless otherwise specified, position and size units used in FTXT
formatting properties and control sequences are in decipoints (720
decipoints/inch). This is ANSI/ISO Positioning Unit Mode (PUM) 2.  While a
metric standard might be nice, decipoints allow the existing U.S.A.
typographic units to be encoded easily, e.g., "12 points" is "120
decipoints".