lling-tooltips.html#cb220-7"></a><span class="co"># trace is the smooth line.</span></span>
<span id="cb220-8"><a href="controlling-tooltips.html#cb220-8"></a><span class="kw">length</span>(w<span class="op">$</span>x<span class="op">$</span>data)</span>
<span id="cb220-9"><a href="controlling-tooltips.html#cb220-9"></a></span>
<span id="cb220-10"><a href="controlling-tooltips.html#cb220-10"></a><span class="co"># use the `y` attribute of the smooth line </span></span>
<span id="cb220-11"><a href="controlli