>optional debugging flag. Setting to 0 turns off debugging,
while setting to 1 causes some debugging information to be printed.</p></dd>

</dl></div>
    <div class="section level2">
    <h2 id="value">Value<a class="anchor" aria-label="anchor" href="#value"></a></h2>
    <p>A character string or expression, in either a long or a shorter
format, for use in the indicated axis at the present plot size.  Whether the
unit is enclosed in parentheses or square brackets is determined by the
value of <a href="https