e running text at
whatever top margin you give.
</p>

<p>
FOOTER_GAP and
<a href="typesetting.html#b-margin">B_MARGIN</a>
work similarly, except they determine where running text <i>ends</i>
on the page.  (See
<a href="#footer-margin">Important &ndash; footer margin and bottom margins</a>
for a warning about possible conflicts between the footer margin and
the bottom margin.)
</p>

<p>
Confused?  Mom apologizes.  It&#8217;s really quite simple.  By
default, mom sets headers <nobr>4-1/2</nobr>
<a href="defin