{
  "$schema": "https://vega.github.io/schema/vega-lite/v6.json",
  "description": "TBT-180 A/B telemetry. Brush the left chart to rebase the right-side share bar and cumulative-gap (A-B) views over the selected window.",
  "vconcat": [
    {
      "title": {
        "text": "Branch share in window",
        "subtitle": "A vs B distribution · reacts to brush"
      },
      "width": 500,
      "height": 44,
      "data": {
        "name": "ev"
      },
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            "param": "brush"
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        }
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      "mark": {
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        "cornerRadius": 20
      },
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          "field": "n",
          "type": "quantitative",
          "stack": "normalize",
          "title": "share of visitors",
          "axis": {
            "format": "%",
            "domain": false,
            "grid": true,
            "values": [
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              0.5,
              0.75
            ]
          }
        },
        "color": {
          "field": "arm",
          "type": "nominal",
          "scale": {
            "domain": [
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              "B"
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          },
          "legend": null
        },
        "order": {
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          "type": "nominal"
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        "tooltip": [
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            "field": "arm",
            "type": "nominal",
            "title": "branch"
          },
          {
            "aggregate": "sum",
            "field": "n",
            "type": "quantitative",
            "title": "cid"
          }
        ]
      }
    },
    {
      "title": {
        "text": "Full run · cumulative",
        "subtitle": "drag a start → end range to rebase"
      },
      "width": 500,
      "height": 200,
      "data": {
        "name": "ev"
      },
      "transform": [
        {
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              "field": "minute"
            }
          ],
          "window": [
            {
              "op": "sum",
              "field": "n",
              "as": "cum"
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          "groupby": [
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          "frame": [
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      ],
      "layer": [
        {
          "params": [
            {
              "name": "brush",
              "select": {
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                "encodings": [
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              }
            }
          ],
          "mark": {
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            "point": false,
            "interpolate": "step-after",
            "strokeWidth": 1
          },
          "encoding": {
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              "type": "temporal",
              "title": "Time (UTC)",
              "axis": {
                "format": "%H:%M"
              }
            },
            "y": {
              "field": "cum",
              "type": "quantitative",
              "title": "Cumulative unique cid"
            },
            "color": {
              "field": "arm",
              "type": "nominal",
              "scale": {
                "domain": [
                  "A",
                  "B"
                ]
              },
              "title": "Branch"
            }
          }
        }
      ]
    },
    {
      "title": {
        "text": "Cumulative gap  A − B",
        "subtitle": "rises when B falls behind · rebased over brush"
      },
      "width": 500,
      "height": 278,
      "data": {
        "name": "ev"
      },
      "transform": [
        {
          "filter": {
            "param": "brush"
          }
        },
        {
          "pivot": "arm",
          "value": "n",
          "groupby": [
            "minute"
          ]
        },
        {
          "calculate": "isValid(datum.A)?datum.A:0",
          "as": "aN"
        },
        {
          "calculate": "isValid(datum.B)?datum.B:0",
          "as": "bN"
        },
        {
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            {
              "field": "minute"
            }
          ],
          "window": [
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              "op": "sum",
              "field": "aN",
              "as": "cumA"
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            {
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              "field": "bN",
              "as": "cumB"
            }
          ],
          "frame": [
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            0
          ]
        },
        {
          "calculate": "datum.cumA - datum.cumB",
          "as": "diff"
        }
      ],
      "layer": [
        {
          "mark": {
            "type": "area",
            "interpolate": "step-after",
            "opacity": 0.16
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              "axis": {
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            "y": {
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              "title": "Cumulative A − B (B deficit)"
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            "y2": {
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            },
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                "title": "A"
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                "type": "quantitative",
                "title": "B"
              },
              {
                "field": "diff",
                "type": "quantitative",
                "title": "A − B"
              }
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          }
        }
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        "arm": "A",
        "n": 1
      },
      {
        "minute": "2026-06-25T14:13",
        "arm": "A",
        "n": 2
      },
      {
        "minute": "2026-06-25T14:15",
        "arm": "B",
        "n": 2
      }
    ]
  }
}