vertical spacing trivia challenge

[G. Branden Robinson]

*roff experts, I present to you another puzzler, not groff-specific.

Here's the qualifying question:

A.  You probably know that the `ps` request to change the type (point)
    size of the font is honored only in troff mode, not by nroff.

    You likely also know that the `ls` request to set the line spacing
    goes way back to before typesetter roff.

    Question: is the `vs` request (which sets the vertical spacing)
    honored in nroff mode?

Now, here's the challenge.

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B.  In nroff (or nroff mode in groff), what _units_ is the argument to
    the `vs` request reckoned in?

C.  A point is less than a vee, right?

D.  What does nroff do if you request to alter the vertical spacing in
    points?

E.  Attempt to address the foregoing questions empirically.  Compare the
    results to the claims of CSTR #54.  Do they agree?

Enjoy your weekend!

Regards,
Branden

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