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4.6.5.1 Text settings
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The 'FAM' string, a GNU extension, sets the font family for body text;
the default is 'T'.  The 'PS' and 'VS' registers set the type size and
vertical spacing (distance between text baselines), respectively.  The
font family and type size are ignored on terminal devices.  Setting
these parameters before the first call of a heading, paragraphing, or
(non-date) document description macro also applies them to headers,
footers, and (for 'FAM') footnotes.

   Which font families are available depends on the output device; as a
convention, 'T' selects a serif family ("Times"), 'H' a sans-serif
family ("Helvetica"), and 'C' a monospaced family ("Courier").  The man
page for the output driver documents its font repertoire.  Consult the
'groff(1)' man page for lists of available output devices and their
drivers.

   The hyphenation mode (as used by the 'hy' request) is set from the
'HY' register.  Setting 'HY' to '0' is equivalent to using the 'nh'
request.  This is a Tenth Edition Research Unix extension.