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(groff)Miscellaneous man macros

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Miscellaneous macros
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   The default indentation is 7.2n for all output devices except for
`grohtml' which ignores indentation.

 - Macro: .DT
     Set tabs every 0.5 inches.  Since this macro is always called
     during a `TH' request, it makes sense to call it only if the tab
     positions have been changed.

 - Macro: .PD [nnn]
     Adjust the empty space before a new paragraph (or section).  The
     optional argument gives the amount of space (default unit is `v');
     without parameter, the value is reset to its default value (1 line
     for tty devices, 0.4v otherwise).

   This affects the macros `SH', `SS', `TP', `LP' (as well as `PP' and
`P'), `IP', and `HP'.