="clear: left;"></div>

  <figure class="cell">
    <div id="transform18"></div>
    <figcaption>
      Four time bins each of 5 minutes by setting the units to minutes and
      timeUnit step to 5.
    </figcaption>
  </figure>
  <div style="clear: left;"></div>

  <figure class="cell">
    <div id="transform19"></div>
    <figcaption>
      <b>window</b> transform to sum values by category used to calculate
      proportion of total.
    </figcaption>
  </figure>

  <figure class="cell">
    <div id="tran