\x89\x50\x4E\x47\x0D\x0A\x1A\x0A
 PNG

\x89\x50\x4E\x47\x0D\x0A\x1A\x0A
#
# Additional predefined groff symbols for special fonts.
#
arrowdown arrowvertbt
arrowup arrowverttp
divide di
equal eq
logicalnot no
minus mi
multiply mu
plusminus +-
plus pl
Upsilon1 *U