span><span class="op">$</span><span class="va">data</span><span class="op">[[</span><span class="fl">2</span><span class="op">]</span><span class="op">]</span><span class="op">$</span><span class="va">n</span><span class="op">[</span><span class="va">node_row</span><span class="op">]</span>
        
        <span class="co"># Offset, in pixels, for location of tooltip relative to mouse cursor,</span>
        <span class="co"># in both x and y direction.</span>
        <span class="va">offset</span> <span cl