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      "name": "column_domain",
      "source": "source_0",
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      "name": "row_domain",
      "source": "source_0",
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    {"name": "child_height", "value": 200}
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    "padding": 20,
    "offset": {"rowTitle": 10, "columnTitle": 10},
    "columns": {"signal": "length(data('column_domain'))"},
    "bounds": "full",
    "align": "all"
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      "name": "row-title",
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          "signal": "isValid(parent[\"Cylinders\"]) ? parent[\"Cylinders\"] : \"\"+parent[\"Cylinders\"]"
        },
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        "style": "guide-label",
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      },
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        {
          "scale": "y",
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          "title": "Miles_per_Gallon",
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          "labelOverlap": true,
          "tickCount": {"signal": "ceil(child_width/40)"},
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      "name": "cell",
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        }
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          "height": {"signal": "child_height"}
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          "style": ["point"],
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              "fill": {"value": "transparent"},
              "stroke": {"scale": "color", "field": "Cylinders"},
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      "nice": true,
      "zero": true
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      "name": "y",
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      "range": [{"signal": "child_height"}, 0],
      "nice": true,
      "zero": true
    },
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      "name": "color",
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      "domain": {"data": "source_0", "field": "Cylinders", "sort": true},
      "range": "category"
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      "name": "shape",
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      "domain": {"data": "source_0", "field": "Origin", "sort": true},
      "range": "symbol"
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            "fill": {"value": "transparent"},
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