{
  "geography": "Natural Earth admin-0 countries, clipped and simplified for this study",
  "geometryFile": "contour-study-geometry.geojson",
  "geometrySHA256": "ce1c3e302e80e5e7d025c97e0e2024e492c7c9c899bd0eb814eb54ad5b0dc7b7",
  "phenomena": "Deterministic synthetic Gaussian fields; not observations or a causal claim",
  "field": "SMOKE night ramp, synthetic AOD 0 to 1",
  "contours": {
    "quantity": "PM2.5",
    "unit": "micrograms per cubic metre",
    "levels": [
      10,
      25,
      40
    ],
    "colour": "#FFFFFF"
  },
  "periods": "Both synthetic layers represent 2026-09-20T12:00:00Z instantaneous values",
  "projection": "Equirectangular coordinates with aspect correction at 48 N",
  "imageSHA256": "646667083d21d2ee3074d6e4c8c07b876419dcff9648f27d1edc000cdfa164a4"
}