external-link">format</a></span><span class="op">(</span><span class="va">at_y</span>, scientific <span class="op">=</span> <span class="cn">FALSE</span><span class="op">)</span>, at <span class="op">=</span> <span class="va">at_y</span>,</span></span>
<span class="r-in"><span>      col <span class="op">=</span> <span class="st">"grey20"</span>, line <span class="op">=</span> <span class="fl">1</span>, cex <span class="op">=</span> <span class="fl">0.8</span><span class="op">)</span></span></span>
<span cla