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  "rootOffsetFromLocalShaftMM": 1,
  "reviewRegionDefinition": "Within [-1,+3] mm of locally fitted shaft radius and 16 mm axial phase distance near a flight, plus flight phase residual over 15 mm. Heuristic review region, not a confidence interval.",
  "reviewTriangleCount": 701133,
  "reviewTrianglePercent": 3.6857602772595826,
  "rootThresholdSensitivity": {
    "description": "Triangles whose shaft/spiral label changes when local radial offset is varied from 0 to +2 mm",
    "triangles": 600928,
    "percent": 3.1589962986951785
  },
  "rootBoundaryAccuracyMM": null,
  "targetBoundaryAccuracyMM": 0.025,
  "targetBoundaryAccuracyVerified": false,
  "method": "Triangle-centroid radius relative to an inter-flight shaft-radius profile and a helical-phase gate separate shaft from flights; fitted two-start phase separates spiral A and B. Whole original triangle records are copied; triangles are not cut or reprojected.",
  "limitations": [
    "Part labels near joints/welds need review; no ground-truth segmentation was supplied.",
    "Unchanged coordinates do not imply correct component boundaries or scanner accuracy.",
    "Source partitions are surface subsets; they are not capped or validated solids.",
    "These source partitions are not the same as the smooth, idealized CAD parts."
  ]
}