{
  "source": "analyses\\nasa2000-figures456-2026-10-02\\figure6-p34-216dpi.png",
  "source_sha256": "632e99608490f554733ce72b5568512ac2d4c7740207c93c576455b1e0ec7010",
  "crop": [
    550,
    250,
    1250,
    960
  ],
  "origin_crop_px": [
    75.0,
    675.0
  ],
  "mach24_vector_px": [
    590,
    -12
  ],
  "beta8_vector_px": [
    -11,
    -646
  ],
  "mapping": "Solve pixel = origin + (Mach/24)*mach24_vector + (beta/8)*beta8_vector. Slight scan skew retained.",
  "method": "36 finite points, actual threshold<100 contiguous-run centres within manually inspected corridors. CSV retains masks, run bounds and original-image coordinates. Linear joins between samples only; no extrapolation.",
  "reading_allowance": {
    "mach": 0.15,
    "beta": 0.12,
    "meaning": "Project visual-reading allowance, not statistical confidence or model uncertainty; scan/calibration and curve thickness dominate."
  },
  "unresolved_discrepancy": "Source prose says beta approximately 7 at Mach 10 and 125000 ft; plotted curve is approximately 4.6. Trace follows graph without forcing prose agreement. Cause unresolved.",
  "scope": "Published calculated equilibrium-air curves behind normal shock at B=1 T. Not measured performance or independently reproduced calculation.",
  "source_record": "https://ntrs.nasa.gov/citations/20000095934",
  "source_locator": "Figure6physical34/printed28; precedingprosephysical33/printed27",
  "refined_mach10_readings": {
    "100000_ft": 1.6322,
    "125000_ft": 4.8222
  },
  "reading_note": "Earlier coarse reading~4.6 and refined interpolation~4.8 both fit retained4.2-5.0visualrange; neither is source numerical data."
}