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  "padding": 5,
  "width": 200,
  "height": 200,
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      "name": "source_0",
      "url": "data/cars.json",
      "format": {"type": "json", "parse": {"Year": "date"}},
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        {
          "field": "Year",
          "type": "timeunit",
          "units": ["year"],
          "as": ["year_Year", "year_Year_end"]
        },
        {
          "type": "aggregate",
          "groupby": ["year_Year"],
          "ops": ["ci0", "ci1", "mean"],
          "fields": [
            "Miles_per_Gallon",
            "Miles_per_Gallon",
            "Miles_per_Gallon"
          ],
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            "lower_Miles_per_Gallon",
            "upper_Miles_per_Gallon",
            "center_Miles_per_Gallon"
          ]
        }
      ]
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      "name": "data_0",
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          "type": "filter",
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      "name": "data_1",
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      "type": "rect",
      "style": ["tick", "errorbar-ticks"],
      "aria": false,
      "from": {"data": "data_0"},
      "encode": {
        "update": {
          "opacity": {"value": 0.7},
          "fill": {"value": "#4c78a8"},
          "tooltip": {
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          "height": {"value": 1}
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      "name": "layer_1_marks",
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      "from": {"data": "data_1"},
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          "opacity": {"value": 0.7},
          "fill": {"value": "#4c78a8"},
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      "name": "layer_2_marks",
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          "ariaRoleDescription": {"value": "errorbar"},
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          },
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          "y2": {"scale": "y", "field": "upper_Miles_per_Gallon"}
        }
      }
    }
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      "name": "x",
      "type": "time",
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          {"data": "data_1", "field": "year_Year"}
        ]
      },
      "range": [0, {"signal": "width"}]
    },
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      "name": "y",
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          {"data": "data_0", "field": "lower_Miles_per_Gallon"},
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      },
      "range": [{"signal": "height"}, 0],
      "zero": false,
      "nice": true
    }
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    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
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      "minExtent": 0,
      "ticks": false,
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      "gridScale": "x",
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      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "Year (year)",
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(width/40)"},
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    },
    {
      "scale": "y",
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