>
<dd><p>Number of empty bins to add to the ends when the range is not
completely specified.  The default is <code>5</code>.</p></dd>


<dt>nbin</dt>
<dd><p>Number of bins for density estimation.  The default is <code>50</code>.</p></dd>


<dt>ab</dt>
<dd><p>Optional range for support associated with the density. Both
values may be equal to <code>NA</code>.  If equal to <code>NA</code>, then corresponding limit will
be based on <code>nicerange()</code>. The default is <code>NULL</code>.</p></dd>


<dt>suppo