[Groff] Hyphens and Dashes

[Andrew J. Piziali]

   Since we do have some professional typesetters in this community,
perhaps you might offer some advise on the proper length hyphen (or
dash) to use for an interjected phrase in a sentence.  For example,
"I might state -- for the sake of emphasis -- that I am also annoyed by
the proliferation of spam messages."  What is the proper length "--" to
use in formatted output?  I have been using the -ms "\*-" character,
somewhat long, but definitely sets the phrase apart.  I could also use
"\-" (a bit shorter) or "-" (shorter still, a true hyphen).

   Thank you.


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