pan class="op">[</span><span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</a></span><span class="op">(</span><span class="va">first_over</span> <span class="op">-</span> <span class="fl">1</span>, <span class="va">first_over</span><span class="op">)</span><span class="op">]</span></span>
<span><span class="fu"><a href="https://rdrr.io/r/stats/uniroot.html" class="external-link">uniroot</a></span><span class="op">(</span><span class="kw">function</span><span class="op">(</span><