title: d3.js data missing, how can I fix it?
body: <p>I use data() to draw lines as many as data.length, but it doesn't work. But if I change lint to circle element, the element number is right. I don't know how to fix it.</p>
  
  <pre><code>inner_svg
  .selectAll('line')
  .data(data)
  .enter()
  .append('line')
  </code></pre>
  
  <p>The code just draws 28 lines, but the data.length is 44.</p>
  
  <pre><code>inner_svg
  .selectAll('circle')
  .data(data)
  .enter()
  .append('circle')
  </code></pre>
  
  <p>If I change the code, then it draws 44 circles.</p>