[Groff] Character spacing and spread

[Greg 'groggy' Lehey]

I've just received a message from O'Reilly's style people containing
this statement:

> However, one thing you can do is set the horizontal scale (or
> stretch) to 95%, and the character spacing (or spread) to -5%. This
> will allow for up to 82 characters across the line--more than a
> screen's width--even with the necessary 0.25" indent all code should
> have.

I understand roughly what this means, but I don't know exactly, and I
certainly don't know how to do it with groff.  Can somebody help?

Greg
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