{
  "measurement": "One-sided spread-tag rates at structural levels, against a permutation-surrogate floor (real tick increments shuffled and cumulatively summed; real spreads shuffled and re-attached).",
  "round_number_levels": {
    "pair": "AUDJPY",
    "n_ticks": 9217310,
    "n_levels": 14,
    "real_up_tag": 0.6679,
    "real_down_tag": 0.6533,
    "surrogate_up_tag": 0.7699,
    "excess_up_tag": -0.102,
    "verdict": "THIN CONFIRMED — up-side spread-tags are a minority / at noise level; the bid-engine missed nothing material; engine investigation COMPLETE"
  },
  "prior_day_and_session_extremes": {
    "real_up_tag": 0.6931,
    "surrogate_up_tag": 0.7751,
    "excess": -0.0819,
    "verdict": "THIN — prior-day up-tags at/below random-walk floor, no widening, no reverse"
  }
}