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  "padding": 5,
  "width": 400,
  "height": 300,
  "style": "cell",
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            "month"
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            "yearmonth_date_end"
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            "yearmonth_date"
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            "sum_count_end"
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              "group": "width"
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              "group": "height"
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      },
      "marks": [
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          "type": "area",
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            "area"
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          },
          "from": {
            "data": "faceted_path_main"
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              "orient": {
                "value": "vertical"
              },
              "fill": {
                "scale": "color",
                "field": "series"
              },
              "description": {
                "signal": "\"series: \" + (isValid(datum[\"series\"]) ? datum[\"series\"] : \"\"+datum[\"series\"]) + \"; date (year-month): \" + (timeFormat(datum[\"yearmonth_date\"], '%Y')) + \"; Sum of count: \" + (format(datum[\"sum_count\"], \"\"))"
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                "field": "yearmonth_date"
              },
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                "field": "sum_count_end"
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                "field": "sum_count_start"
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        "field": "yearmonth_date"
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        {
          "signal": "width"
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          "sum_count_end"
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      "range": [
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          "signal": "height"
        },
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      "nice": true,
      "zero": true
    },
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      "name": "color",
      "type": "ordinal",
      "domain": {
        "data": "source_0",
        "field": "series",
        "sort": true
      },
      "range": {
        "scheme": "category20b"
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    {
      "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": "x",
      "orient": "bottom",
      "grid": false,
      "title": "date (year-month)",
      "domain": false,
      "format": "%Y",
      "tickSize": 0,
      "labelFlush": true,
      "labelOverlap": true,
      "tickCount": {
        "signal": "ceil(width/40)"
      },
      "zindex": 0
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      "fill": "color",
      "symbolType": "circle",
      "title": "series"
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