[Groff] Inserting raw PostScript output

[Greg 'groggy' Lehey]

I'm playing around with some macros to change text colour in
PostScript output from groff.  I've written the following macro:

  .de colour
  \X'ps: exec \\$1 \\$2 \\$3 setrgbcolor'
  ..

This works, up to a point.  The trouble is that it offsets the
remainder of the text by 10 points down, presumably a line space.  How
can I get rid of this?  I've tried adding a \v'-10p' to the macro, but
this has no effect.

Apart from that question, of course, there's a more obvious one: is
there a better way to do this?

Greg
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