{
  "$schema": "urn:prism:schema:v1:spec",
  "title": "Daily score (x-axis brush)",
  "data": {
    "name": "daily",
    "values": [
      {"day": 1,  "score": 0.41},
      {"day": 2,  "score": 0.48},
      {"day": 3,  "score": 0.52},
      {"day": 4,  "score": 0.55},
      {"day": 5,  "score": 0.61},
      {"day": 6,  "score": 0.58},
      {"day": 7,  "score": 0.64},
      {"day": 8,  "score": 0.69},
      {"day": 9,  "score": 0.72},
      {"day": 10, "score": 0.68},
      {"day": 11, "score": 0.71},
      {"day": 12, "score": 0.74},
      {"day": 13, "score": 0.77},
      {"day": 14, "score": 0.80},
      {"day": 15, "score": 0.76},
      {"day": 16, "score": 0.78},
      {"day": 17, "score": 0.82},
      {"day": 18, "score": 0.84},
      {"day": 19, "score": 0.81},
      {"day": 20, "score": 0.85},
      {"day": 21, "score": 0.83},
      {"day": 22, "score": 0.87},
      {"day": 23, "score": 0.89},
      {"day": 24, "score": 0.86},
      {"day": 25, "score": 0.90},
      {"day": 26, "score": 0.88},
      {"day": 27, "score": 0.92},
      {"day": 28, "score": 0.91},
      {"day": 29, "score": 0.93},
      {"day": 30, "score": 0.94}
    ]
  },
  "selection": {
    "brush": {
      "type": "interval",
      "encodings": ["x"]
    }
  },
  "mark": "line",
  "encoding": {
    "x": {"field": "day",   "type": "quantitative"},
    "y": {"field": "score", "type": "quantitative"}
  }
}