 w, y2: <span class="hljs-number">0</span>}
              ]);
          lines.enter().append(<span class="hljs-string">'line'</span>);
          lines
            .attr(<span class="hljs-string">'x1'</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-params">(d)</span> {</span> <span class="hljs-keyword">return</span> d.x1; })
            .attr(<span class="hljs-string">'y1'</span>, <span class="hljs-function"><span class="hljs-keyword">function</span> <span cla