{
  "schema_version": 1,
  "chart_type": "cartesian",
  "meta": {
    "title": "Revenue forecast uncertainty widens into spring",
    "quality_profile": "showcase"
  },
  "data": {
    "columns": [
      {
        "id": "month",
        "type": "date",
        "label": "Month",
        "values": [
          "2026-10",
          "2026-11",
          "2026-12",
          "2027-01",
          "2027-02",
          "2027-03",
          "2027-04",
          "2027-05"
        ]
      },
      {
        "id": "lower",
        "type": "number",
        "unit": "GBP k",
        "label": "Lower forecast bound",
        "values": [
          92,
          98,
          101,
          103,
          104,
          105,
          105,
          104
        ]
      },
      {
        "id": "forecast",
        "type": "number",
        "unit": "GBP k",
        "label": "Revenue forecast",
        "values": [
          100,
          108,
          113,
          118,
          122,
          127,
          131,
          135
        ]
      },
      {
        "id": "upper",
        "type": "number",
        "unit": "GBP k",
        "label": "Upper forecast bound",
        "values": [
          108,
          118,
          125,
          133,
          140,
          149,
          157,
          166
        ]
      }
    ]
  },
  "encoding": {
    "x": {
      "column": "month",
      "scale": "time",
      "label": "Month"
    },
    "y": {
      "zero": false,
      "label": "Monthly revenue (GBP k)"
    }
  },
  "series": [
    {
      "id": "interval",
      "mark": "range",
      "lower": "lower",
      "upper": "upper",
      "label": "Forecast uncertainty",
      "meaning": "80% prediction interval",
      "role": "comparison"
    },
    {
      "id": "forecast",
      "mark": "line",
      "y": "forecast",
      "label": "Revenue forecast",
      "role": "primary",
      "point": true
    }
  ],
  "interactions": {
    "brush": "x"
  },
  "cards": [
    {
      "title": "Takeaway",
      "items": [
        "The forecast rises from GBP 100k in October to GBP 135k in May.",
        "The 80% prediction interval expands from GBP 92k–108k to GBP 104k–166k."
      ]
    }
  ]
}