groff: Embedding PDF
7.4.2 Embedding PDF
-------------------
The escape sequence
'\X'pdf: pdfpic FILE ALIGNMENT WIDTH [HEIGHT] [LINELENGTH]''
places a rectangle of the specified WIDTH containing the PDF drawing
from file FILE of desired WIDTH and HEIGHT (if HEIGHT is missing or zero
then it is scaled proportionally). If ALIGNMENT is '-L' the drawing is
left aligned. If it is '-C' or '-R' a LINELENGTH greater than the width
of the drawing is required as well. If WIDTH is specified as zero then
the width is scaled in proportion to the height.