ass="fu">curve_interval</span><span class="op">(</span></span>
<span>  <span class="va">.data</span>,</span>
<span>  <span class="va">...</span>,</span>
<span>  .along <span class="op">=</span> <span class="cn">NULL</span>,</span>
<span>  .width <span class="op">=</span> <span class="fl">0.5</span>,</span>
<span>  na.rm <span class="op">=</span> <span class="cn">FALSE</span>,</span>
<span>  .interval <span class="op">=</span> <span class="fu"><a href="https://rdrr.io/r/base/c.html" class="external-link">c</