Embed ascii diagram in groff?

I have groff file to generate a pdf in the format: .TL Article title .AU Author name .AI Publication title .SH .LP First paragraph .PP More paragraphs I'm then running groff -ms a.ms -T pdf > a.pdf to generate a pdf. I like how groff makes formatting easy but I'm wondering if it would be possible to include an ascii diagram. For example the following: +-------------------------+ +-----------------+ | | | | | Hello | | | | +-------------+ | | | | | +-------------------------+ +-----------------+ If input as a normal paragraph turns into: Is there anyway I can insert a section into groff that will preserve the spaces so these kind of diagrams can be used? Looking at the manual for groff_ms I see: > .PS and .PE Denotes a graphic, to be processed by the pic > preprocessor. You can create a pic file by hand, using the AT&T pic > manual available on the Web as a reference, or by using a graphics > program such as xfig. But this seems to only accept pic language markup . Is there anyway I can insert assci drawings into groff?