("usr")[1]</code>,
and <code>"top"</code> uses <code>graphics::par("usr")[4]</code>.</p>
<p>When <code>adjPreset</code> is <code>"default"</code> it will use the <code>preset</code> to
define a reciprocal text placement. For example when <code>preset="topright"</code>
the text placement will be equivalent to <code>adjPreset="bottomleft"</code>.
The <code>adjPreset</code> terms <code>"top"</code>, <code>"bottom"</code>, <code>"right"</code>, <code>"left"</code>,
and <code>"center"</code> refer to the text la