Where is `phillylatlong2.json` supposed to load from? I don't see it attached to this notebook. Here's one way to change the diameter of the `markCircle` with respect to row count of a given category: ``` vl.size().fieldN("Geo group") .scale( { "range": [100,5000] } ) ```

``` vl.markBar() .width(500) ``` Don't forget you can set the height and width of the visualization. This is looking a little cramped!