functions using R's base graphics:
<code><a href="axes_2d_graphics.html">axes_2d_graphics</a>()</code>,
<code><a href="density_2d_graphics.html">density_2d_graphics</a>()</code>,
<code><a href="group_2d_graphics.html">group_2d_graphics</a>()</code>,
<code><a href="label_2d_graphics.html">label_2d_graphics</a>()</code>,
<code><a href="points_2d_graphics.html">points_2d_graphics</a>()</code>,
<code><a href="qq_2d_graphics.html">qq_2d_graphics</a>()</code>,
<code><a href="rect_2d_graphics.html">rect_2d_graphic