larly, it is intended to help define corresponding text
adjustments, using <code>adj</code> compatible with <code><a href="https://rdrr.io/r/graphics/text.html" class="external-link">graphics::text()</a></code>,
using preset terms like "bottomright", "center".</p>
<p>When <code>preset</code> is <code>"default"</code>, the original <code>x,y</code> coordinates
are used. Otherwise the <code>x,y</code> coordinates are defined using the
plot region coordinates, where <code>"left"</code> uses <code>graphics::par