Sandy

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] }
          )
```

Nabil Kashyap

```
vl.markBar()
  .width(500)
```

Don't forget you can set the height and width of the visualization. This is looking a little cramped!