"st">"b"</span>, pch<span class="op">=</span><span class="fl">20</span>, col<span class="op">=</span><span class="st">"dodgerblue"</span>,</span></span>
<span class="r-in"><span>   main<span class="op">=</span><span class="st">"Comparison of lens=+10 to lens=-10"</span><span class="op">)</span>;</span></span>
<span class="r-in"><span><span class="fu">graphics</span><span class="fu">::</span><span class="fu"><a href="https://rdrr.io/r/graphics/points.html" class="external-link">points</a></span><span class="