a <span class="op">=</span> <span class="fu">mosaicData</span><span class="fu">::</span><span class="va"><a href="https://rdrr.io/pkg/mosaicData/man/Births.html" class="external-link">Births78</a></span><span class="op">)</span></span></span>
<span class="r-plt img"><img src="gf_line-2.png" alt="" width="700" height="433"></span>
<span class="r-in"><span><span class="co"># lines make the exceptions stand out more prominently</span></span></span>
<span class="r-in"><span><span class="fu">gf_line</span><span 