{
  "source": "IB5894.tif",
  "source_sha256": "e227680ee38936714dfd56e27beeeef4f2c2ae5eaad2843d557fcb84af5f891e",
  "trace_count": 3,
  "traces": [
    {
      "id": "A-left",
      "group": "Left flanking comparison A",
      "samples": 6536,
      "y_original_one_based": [
        1264,
        7799
      ],
      "half_width": 4.5,
      "plot": "A-left.svg",
      "csv": "A-left.csv",
      "x_center_original_one_based": 2114.4860845286753,
      "extraction": "specreduce BoxcarExtract, fractional-pixel aperture width 9; common external two-sided Background",
      "trace_note": "Constrained flanking emission-contrast FitTrace"
    },
    {
      "id": "B-middle",
      "group": "Middle record B",
      "samples": 6536,
      "y_original_one_based": [
        1264,
        7799
      ],
      "half_width": 4.5,
      "plot": "B-middle.svg",
      "csv": "B-middle.csv",
      "x_center_original_one_based": 2145.9435225841103,
      "extraction": "specreduce BoxcarExtract, fractional-pixel aperture width 9; common external two-sided Background",
      "trace_note": "Separate central-lane FitTrace; lower-half centroid with bounded extrapolation into faint upper record"
    },
    {
      "id": "A-right",
      "group": "Right flanking comparison A",
      "samples": 6536,
      "y_original_one_based": [
        1264,
        7799
      ],
      "half_width": 4.5,
      "plot": "A-right.svg",
      "csv": "A-right.csv",
      "x_center_original_one_based": 2179.4870574058436,
      "extraction": "specreduce BoxcarExtract, fractional-pixel aperture width 9; common external two-sided Background",
      "trace_note": "Constrained flanking emission-contrast FitTrace"
    }
  ],
  "layout": "A-left / B-middle / A-right",
  "previous_two_track_extraction": "Superseded: incomplete spatial model and truncated lower end; do not use for line identification",
  "native_y_interval_one_based": [
    1264,
    7800
  ],
  "software": {
    "specreduce": "1.9.0",
    "rascal": "0.3.11"
  },
  "background": "specreduce.Background with two external sidebands, excluding all three records",
  "sampling": "Original native Y sampling; one bilinear cross-dispersion rectification; fractional-pixel boxcar extraction",
  "trace_non_crossing": true,
  "profile_structure_comparisons": {
    "A-left vs A-right": {
      "peak_correlation": 0.9670288255816595,
      "lag_native_y_pixels": 3
    },
    "A-left vs B-middle": {
      "peak_correlation": 0.1486487626903357,
      "lag_native_y_pixels": 1
    },
    "A-right vs B-middle": {
      "peak_correlation": 0.2068403974541063,
      "lag_native_y_pixels": 1
    }
  },
  "cautions": [
    "Middle B is poorly exposed in some upper intervals; lower-half center fit is extrapolated within bounded spatial lane",
    "Extended to Y fraction .803, beyond the formerly clipped bright feature",
    "Scanner counts are not calibrated physical flux",
    "A\u2013B\u2013A similarity does not by itself identify lamp chemistry or prove that B is a stellar spectrum"
  ]
}