'columns-variable'>
    columns
    =
  </dt>
  <dd>
    <pre><code class='coffeescript'>[]</code></pre>
    <div class='docstring'>
  <p>[Array<c3.Table.Column>] An array of column objects which describe how to construct the table.
Column objects can contain the following members:</p><ul>
<li><strong>header</strong> [<a href='../../class/c3/Selection.Options.html'>c3.Selection.Options</a>] Options to describe the header contents, styles, events, etc. Use <code>text</code> or <code>html</code> to define the