{
 "id": "hydrogen",
 "title": "HYDROGEN LINE · 21cm",
 "status": "NOMINAL",
 "updated": null,
 "readings": [
  {
   "label": "H I rest frequency",
   "value": "1420.406 MHz",
   "meaning": "professional survey REFERENCE, not a local receiver measurement"
  },
  {
   "label": "backyard instrument",
   "value": "BENCH TESTING",
   "meaning": "NO SKY DETECTION — files are not scientific validation. Transport tests are not RF measurements."
  }
 ],
 "note": "NO SKY DETECTION. LAB brightness temperature (K) and receiver relative power (dB) are separate, uncalibrated scales. No automated candidate or detection promotion. Bench checkpoint September 10, 2026: amplifier power unresolved, manufacturer diagnosis next.",
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 "chart": {
  "xLabel": "MHz",
  "yLabel": "per-series raw units"
 },
 "attribution": "LAB Survey (Kalberla et al. 2005) via AIfA EU-HOU",
 "policyVersion": 2,
 "retrievedAt": "2026-10-12T02:22:02.569Z",
 "reused": false
}