_UNDERLINE DOUBLE 1.5 1.5p 1.5p
      - turn double-underlining on; set the rule weight to 1-1/2
        points; set the gap between the string and the upper
        underline to 1-1/2 points; set the gap between the upper
        and the lower underline to 1-1/2 points
</span>
Note, from the above, that in all instances, underscoring (single or
double) is enabled whenever BIBLIOGRAPHY_STRING_UNDERSCORE is used
in this way.
</p>

<p>
By default, mom double-underscores the title if your
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