{
 "n_candidates": 15936,
 "n_with_pings": 217,
 "refuted": 196,
 "ambiguous": 16,
 "supported_raw": 5,
 "supported_after_garbage_check": 1,
 "garbage_note": "four 'supported' Arctic sites were one vessel logging a constant 0.7 m over 100 m water",
 "bc_note": "the one remaining supported site (48.969N 123.070W) is 530 m from shore in 60-110 m water with small-boat pings of 5-8 m: coastal shallows, not an offshore shoal",
 "sealed_claim_refuted": {
  "region": "St. Lawrence estuary",
  "lat": 47.633,
  "lon": -70.046,
  "predicted_m": 3.2,
  "chart_m": 30,
  "pings_within_300m": 613,
  "ping_depth_q10_q50_q90": [
   27.2,
   32.0,
   36.7
  ]
 },
 "caveat": "ships choose safe water, so pings within 300 m can miss a pinnacle narrower than 100 m; refutation is strong for broad shoals, weaker for pinnacles"
}