man.th.extra3.max.length — Maximum length of extra3 in header/footer
Specifies the maximum permitted length of the
extra3 part of the man-page
title line header/footer. If the
exceeds the maxiumum specified, it is truncated down to the maximum
The content of the
extra3 field is usually
displayed in the middle header of the page and is typically a "manual
name"; for example, "GTK+ User's Manual" (from the
gtk-options(7) man page).
The default value for this parameter is reasonable but somewhat arbitrary. If you are processing pages with long "manual names" -- or especially if you are processing pages that have both long "title" parts (command/function, etc. names) and long manual names -- you may want to experiment with changing the value in order to achieve the correct aesthetic results.