Why do you remove?

Why not just `display: none`. or in jQuery `$('#summary').hide();` that way you can show it again later...
This is very useful when displaying one histogram incase people remove the other series...

Also, don't do it this way... Do something like:
```html
<h2 class="single-histogram-only">summary</h2>
<dl class="single-histogram-only">....</dl>
```
Then add the class `single-histogram-only` to all element you want to disapper when you have multiple histograms.
Then in your update code you just do:
```js
if(/*have multiple histograms*/) {
  $('.single-histogram-only').hide();
} else {
  $('.single-histogram-only').show();
}
```
Less code and state will be restored when people remove all the other series so there is only one left. This way you always have a consistent view when the window is refreshed.