o, say, 1/4
<a href="definitions.html#em">em</a>, do
<br/>
<span class="pre-in-pp">
  .HEADER_RULE_GAP .25m
</span>
</p>

<div class="box-tip">
<p class="tip">
<span class="note">Note:</span>
Replace HEADER_, above, with FOOTER_ if you&#8217;re using
<a href="definitions.html#footer">footers</a>
and want to change the separator rule gap.  In footers, the gap is
measured from the top of the tallest
<a href="definitions.html#ascender">ascender</a>
in the footer.
</p>

<p class="tip-bottom">
<span class="addit