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  "axis": "Original scan Y, one-based native pixel centers; no wavelength calibration",
  "ordinate": "Background-subtracted cross-trace mean of scanner values; not physical flux or calibrated optical density",
  "sampling": "Subpixel linear interpolation only across the trace, one sample per native Y pixel; no smoothing of final profiles",
  "background": "Mean of left and right 11-pixel-wide sidebands, offsets halfwidth+10 through halfwidth+20 pixels. Sideband MAD is local scatter, not a calibrated flux error.",
  "trace_fitting": "Smoothed envelopes locate cross-trace centers; quadratic for IB5894, linear for OP records. Trace geometry is estimated on 2x binned pixels; measurements use the original TIFF.",
  "cautions": [
    "No wavelength/element/object identification or scanner/emulsion response calibration",
    "Individual plots use local strip contrast; overview normalizes each curve independently",
    "Some faint tracks have low contrast and uncertain backgrounds",
    "IB5894 shaded intervals indicate nearby visible blemishes, not corrected data",
    "Aperture-mean saturation check does not exclude saturation of individual pixels"
  ],
  "normalization_note": "CSV records retain native scanner counts; normalized overview is for pattern inspection only"
}