h1>Vietnam</h1>
  <div id="datestring"></div>
  <input id="date" title="date selector" type="range" min="-1800" max="1500" />
  <div id="deepscatter">
    <div>
      <div id="left-overlay" class="overlay"></div>
      <div id="color-legend" class="overlay"></div>
    </div>
  </div>
</body>

<script type="module" lang="ts">
  import {Scatterplot} from './src/deepscatter';
  import { select } from 'd3-selection';

  window.select = select; // For the click function below.

  const prefs = {
    source_url: 