>1970</span>, <span class="va">fit</span><span class="op">$</span><span class="va">function_call</span><span class="op">$</span><span class="va">y</span>, type <span class="op">=</span> <span class="st">'p'</span>, ylim <span 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="fl">500</span>, <span class="fl">1400</span><span class="op">)</span>, </span>
<span>     xlab <span class="op">=</span> <span class="cn"