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    "source": [
     "data/derived/comets/spectra/3I_ATLAS.skysub.csv.txt",
     "data/derived/comets/spectra/3I_ATLAS.D6.csv.txt"
    ]
   }
  },
  "filter": "D5 sky-subtracted, 3 px aperture, 3.85-4.42 um, finite non-zero flux, positive error",
  "units": "mJy"
 },
 "census": {
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  "co2": {
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   "q84": 4.175121566700826e+27,
   "q50_alt_tau_g": 3.8231617618479113e+27,
   "q50_alt_velocity": 2.0490969143547244e+27,
   "sys_tau_g": 1.1181610837454468,
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   "snr_det": 41.14338987037524,
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   "chi2_red": 185.21763388258398,
   "t_rot_k": 80.0,
   "n_exposures": 16,
   "status": "with_systematics"
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  "co": {
   "class": "candidate",
   "q50": 4.999896892521404e+27,
   "ratio_co_co2": 1.4654010419178571,
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   "chi2_red": 348.34806923041657
  },
  "h2o": {
   "class": "no_coverage",
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   "q50": null,
   "q84": null,
   "upper_2sigma": null,
   "snr": null,
   "chi2_red": null,
   "co2_h2o": null
  },
  "aperture": {
   "q_2px": 3.3203553932843756e+27,
   "q_3px": 3.3890899276667877e+27,
   "q_5px": 3.47562427324377e+27,
   "q_8px": 3.3347834820524905e+27,
   "dlnq_dlnrho": 0.007732435443435218,
   "q8_over_q2": 1.0043453447174049
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 },
 "validation": [
  {
   "id": "3i-atlas_co2_2025-08",
   "comet": "3I/ATLAS",
   "species": "CO2",
   "epoch": "2025-08",
   "measured": 1.17e+27,
   "measured_lo": 8.6e+26,
   "measured_hi": 1.38e+27,
   "stat_err": 3e+25,
   "chi2_red": 27.5,
   "unit": "s-1",
   "published_lo": 9.4e+26,
   "published_hi": 1.6e+27,
   "source": "Lisse et al. 2025, RNAAS, arXiv:2508.15469 (0.94e27, preliminary); Lisse et al. 2026, ApJL 1000, L52, arXiv:2512.07318 (1.6e27 +/- 0.16e27)",
   "provenance": "python3 research/11_band_physical.py (research repo, read-only; input data/derived/3I_aug2025_D5_skysub.csv, 28 in-band points)",
   "interval_source": "research notes docs/06 section 5 (Monte Carlo, recipe A); NOT re-run in this build"
  }
 ]
}