span></span></span>
<span class="r-in"><span><span class="fu"><a href="https://rdrr.io/r/graphics/title.html" class="external-link">title</a></span><span class="op">(</span><span class="st">"Numbers are the data"</span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="interpBarnes-1.png" alt="" width="700" height="700"></span>
<span class="r-in"><span></span></span>
<span class="r-in"><span><span class="co"># 2. As 1, but blank out spots where data are sparse</span></span></span>
<sp