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  "padding": 5,
  "width": 200,
  "height": 200,
  "style": "cell",
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          "ci1": 23.5007,
          "ci0": 19.6912,
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    {
      "name": "data_0",
      "source": "source_0",
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        {"type": "formula", "expr": "toDate(datum[\"Year\"])", "as": "Year"},
        {
          "field": "Year",
          "type": "timeunit",
          "units": ["year"],
          "as": ["year_Year", "year_Year_end"]
        }
      ]
    },
    {
      "name": "data_1",
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        {"type": "formula", "expr": "datum[\"ci0\"]", "as": "upper_ci1"},
        {"type": "formula", "expr": "datum[\"ci1\"]", "as": "lower_ci1"}
      ]
    }
  ],
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    {
      "name": "layer_0_layer_0_marks",
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      "style": ["area", "errorband-band"],
      "sort": {"field": "datum[\"year_Year\"]"},
      "from": {"data": "data_1"},
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          "opacity": {"value": 0.3},
          "orient": {"value": "vertical"},
          "fill": {"value": "#4c78a8"},
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          },
          "description": {
            "signal": "\"Year (year): \" + (timeFormat(datum[\"year_Year\"], '%b %d, %Y')) + \"; Mean of Miles per Gallon (95% CIs): \" + (format(datum[\"lower_ci1\"], \"\")) + \"; upper_ci1: \" + (format(datum[\"upper_ci1\"], \"\")) + \"; ci0: \" + (format(datum[\"upper_ci1\"], \"\")) + \"; ci1: \" + (format(datum[\"lower_ci1\"], \"\"))"
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          "y": {"scale": "y", "field": "lower_ci1"},
          "y2": {"scale": "y", "field": "upper_ci1"},
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            "signal": "isValid(datum[\"year_Year\"]) && isFinite(+datum[\"year_Year\"]) && isValid(datum[\"lower_ci1\"]) && isFinite(+datum[\"lower_ci1\"])"
          }
        }
      }
    },
    {
      "name": "layer_1_marks",
      "type": "line",
      "style": ["line"],
      "sort": {"field": "datum[\"year_Year\"]"},
      "from": {"data": "data_0"},
      "encode": {
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          "y": {"scale": "y", "field": "center"},
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            "signal": "isValid(datum[\"year_Year\"]) && isFinite(+datum[\"year_Year\"]) && isValid(datum[\"center\"]) && isFinite(+datum[\"center\"])"
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        }
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          {"data": "data_1", "field": "year_Year"},
          {"data": "data_0", "field": "year_Year"}
        ]
      },
      "range": [0, {"signal": "width"}]
    },
    {
      "name": "y",
      "type": "linear",
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        "fields": [
          {"data": "data_1", "field": "lower_ci1"},
          {"data": "data_1", "field": "upper_ci1"},
          {"data": "data_0", "field": "center"}
        ]
      },
      "range": [{"signal": "height"}, 0],
      "zero": false,
      "nice": true
    }
  ],
  "axes": [
    {
      "scale": "x",
      "orient": "bottom",
      "gridScale": "y",
      "grid": true,
      "tickCount": {"signal": "ceil(width/40)"},
      "domain": false,
      "labels": false,
      "aria": false,
      "maxExtent": 0,
      "minExtent": 0,
      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "y",
      "orient": "left",
      "gridScale": "x",
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      "tickCount": {"signal": "ceil(height/40)"},
      "domain": false,
      "labels": false,
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      "ticks": false,
      "zindex": 0
    },
    {
      "scale": "x",
      "orient": "bottom",
      "grid": false,
      "title": "Year (year)",
      "format": {
        "signal": "timeUnitSpecifier([\"year\"], {\"year-month\":\"%b %Y \",\"year-month-date\":\"%b %d, %Y \"})"
      },
      "labelFlush": true,
      "labelOverlap": true,
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    },
    {
      "scale": "y",
      "orient": "left",
      "grid": false,
      "title": "Mean of Miles per Gallon (95% CIs)",
      "labelOverlap": true,
      "tickCount": {"signal": "ceil(height/40)"},
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  ]
}