><p>ggplot2 theme to be used. Current options are <code>"bw"</code>,
<code>"classic"</code>, and <code>"grey"</code> (or <code>"gray"</code>). Default is
<code>"bw"</code>.</p></dd>
<dt>axis.text.size</dt>
<dd><p>Specifies the size of the text for the axis labels of
all plots in the panel.</p></dd>
<dt>title.text.size</dt>
<dd><p>Specifies the size of the text for the titles of all
plots in the panel.</p></dd>
<dt>title.opt</dt>
<dd><p>Indicates whether or not to include a title on the plots in
the panel. S