lette from the <strong>RColorBrewer</strong> package, but one can also supply custom color codes or a color palette function like <code>colorRamp()</code>). Figure <a href="overview.html#fig:color-mapping">2.2</a> provides a visual diagram of how this particular mapping works, but the same sort of idea can be applied to other visual properties like size, shape, linetype, etc.</p>
<div class="figure" style="text-align: center"><span id="fig:color-mapping"></span>
<img src="images/color-mapping.svg" alt="Mapp