{
  "$schema": "https://vega.github.io/schema/vega-lite/v2.json",
  "config": {"background":"#ffffff"},     
  "data": { "url": "data/cars.csv" },
  "mark": "bar",
  "encoding": {
    "x": {"field": "city-mpg", "type": "quantitative", "bin": true, "axis": {"title": "City MPG"}},
    "y": { "type": "quantitative", "aggregate": "count"}
  }
}