return</span> d.y2; })
            .style(<span class="hljs-string">'stroke-width'</span>, lineWidth)
            .style(<span class="hljs-string">'stroke-opacity'</span>, <span class="hljs-number">0.2</span>)
            .style(<span class="hljs-string">'stroke'</span>, <span class="hljs-string">'black'</span>)
            .call(lineDrag);
        });</pre></div></div>
            
        </li>
        
        
        <li id="section-23">
            <div class="annotation">
              
             