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  "background": "white",
  "padding": 5,
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    "headerBand": {"column": 0.5},
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    "align": "all"
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      "name": "column-title",
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          "signal": "isValid(parent[\"Origin\"]) ? parent[\"Origin\"] : \"\"+parent[\"Origin\"]"
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      ],
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              "labelOverlap": true,
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              "name": "child_facet",
              "data": "facet",
              "groupby": ["Cylinders"]
            }
          },
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            {
              "source": "child_facet",
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                {
                  "type": "filter",
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              "height": {"signal": "child_child_height"}
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          },
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              "name": "child_child_marks",
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              "style": ["point"],
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                  "opacity": {"value": 0.7},
                  "fill": {"value": "transparent"},
                  "stroke": {"value": "#4c78a8"},
                  "ariaRoleDescription": {"value": "point"},
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                    "signal": "\"Horsepower: \" + (format(datum[\"Horsepower\"], \"\")) + \"; Acceleration: \" + (format(datum[\"Acceleration\"], \"\"))"
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              "tickCount": {"signal": "ceil(child_child_width/40)"},
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    {
      "name": "x",
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      "nice": true,
      "zero": true
    },
    {
      "name": "y",
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      "domain": {"data": "data_2", "field": "Acceleration"},
      "range": [{"signal": "child_child_height"}, 0],
      "nice": true,
      "zero": true
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}