nsparency and jittering</a></li>
<li class="chapter" data-level="18.2" data-path="overlapping-points.html"><a href="overlapping-points.html#d-histograms"><i class="fa fa-check"></i><b>18.2</b> 2D histograms</a></li>
<li class="chapter" data-level="18.3" data-path="overlapping-points.html"><a href="overlapping-points.html#contour-lines"><i class="fa fa-check"></i><b>18.3</b> Contour lines</a></li>
</ul></li>
<li class="chapter" data-level="19" data-path="color-pitfalls.html"><a href="color-pitfalls.html"><i 