{
  "source": "NASA/TP-2000-210387 Figure 5, physical page 32, printed page 26",
  "source_sha256": "12867527b3417f5f99a39c2bae26b663a2d297157c565ccf3f6d4a1402f41bdf",
  "render": "analyses/nasa2000-visual-2026-10-02/p27-38/p32.png",
  "render_sha256": "aba4d9b3594159f79f2dd482d9e39b309b392e6e3211cefcc83f18bc16e3b8b5",
  "render_size_px": [
    915,
    1188
  ],
  "calibration": {
    "unseeded": {
      "origin_px": [
        334,
        447
      ],
      "x24_px": [
        628,
        442
      ],
      "y8_px": [
        328,
        140
      ]
    },
    "seeded": {
      "origin_px": [
        343,
        903
      ],
      "x24_px": [
        637,
        898
      ],
      "y8_px": [
        337,
        596
      ]
    }
  },
  "transform": "Affine linear axes; three anchors per panel account for slight scanned-page skew. X anchor=24 Mach, Y anchor=8 1/(m T^2).",
  "selection": "Pixel-refined visible dark-run centres (grayscale <120), finite sample points only. No extrapolation to unresolved low-Mach baseline. Samples shifted in x onto visible dashed marks when needed; no sample centre placed in a dash gap. Straight segments join selected samples.",
  "allowances": "Project visual-reading allowances +/-0.3 Mach and +/-0.1 1/(m T^2), intentionally coarser than trace width; not measured uncertainties or statistical confidence intervals.",
  "units": "sigma/(rho_inf*u_inf), 1/(m T^2); not the dimensionless interaction parameter without B^2 L.",
  "status": "Approximate redraw of published computed curves, not experimental observations, original numerical data, or independent model reproduction.",
  "points": 59,
  "conversion_limit": "Conversion toQ requires B^2L and compatible mass-flux convention.",
  "standalone_replot": "Use replot.py with figure5-approximate.csv and matplotlib."
}