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{  "$schema": "https://vega.github.io/schema/vega-lite/v4.json",  "data": {"url": "data/movies.json"},  "layer": [{    "mark": "bar",    "encoding": {      "x": {"field": "IMDB Rating", "bin": true},      "y": {"aggregate": "count"}    }  },{    "mark": "rule",    "encoding": {      "x": {"aggregate": "mean", "field": "IMDB Rating"},      "color": {"value": "red"},      "size": {"value": 5}    }  }]}