
    <figcaption>
      Linear <b>regression</b> transform with coefficients and R-squared
      values displayed.
    </figcaption>
  </figure>
  <div style="clear: left;"></div>

  <figure class="cell">
    <div id="transform12"></div>
    <figcaption>
      <b>flatten</b> transform to flatten nested objects.
    </figcaption>
  </figure>
  <div style="clear: left;"></div>

  <figure class="cell">
    <div id="transform13"></div>
    <figcaption>
      <b>fold</b> transform for tidying data. Should produc