{
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  "contactParameters": {
    "pressurePerGapPaPerM": 10000000000,
    "boneGapM": 0.00015,
    "tissueGapM": 0.0003,
    "samplesPerTriangle": 4,
    "elbowRefinementRadiusM": 0.07,
    "area": "reference boundary triangle area",
    "useDistanceCurvature": true,
    "boneSampling": "Symmetric tissue-to-bone and bone-to-tissue surface quadrature, half reference area per direction",
    "tendonSampling": "Five material samples per routed axial leg; authored equivalent circular side area from A0, line clearance only, insertion endpoints exempt",
    "tangent": "Active closest-feature second-order differential; below 10 nm distance, Gauss-Newton degeneracy fallback"
  },
  "parameters": {
    "segmentMassKg": 1.534315,
    "segmentCOMDistanceM": 0.181479,
    "segmentInertiaCOMKgM2": 0.020062,
    "gMPerS2": 9.81,
    "jointDampingNmS": 0.01,
    "activationTimeS": 0.04,
    "releaseTimeS": 0.06,
    "stepS": 0.01,
    "stopStiffnessNmPerRad": 50,
    "minimumAngleRad": 0,
    "maximumAngleRad": 2.0943951023931953,
    "stationarityToleranceN": 0.0001,
    "preconditionerOnlyFloorNPerM": 0.001,
    "solveRegularizationFloorNPerM": 0.001,
    "initialSolveRegularizationNPerM": 1000,
    "adaptRegularizationToStep": true,
    "sourceModel": "Arm26 r_ulna_radius_hand: mass, mass_center and inertia[2]; mapped rigid model frame, not patient calibration"
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  "requestedSteps": 2,
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      "accepted": false,
      "reason": "nonlinear iteration limit",
      "residualN": 0.034075786887506565,
      "elapsedMS": 455487.695232
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  "completedAllSteps": false,
  "limits": [
    "Original source bones; explicitly repaired atlas-derived belly reference volumes.",
    "63 P2 Galerkin displacement modes per head; no full nodal convergence claim.",
    "Tendon geometry, 20% area fractions, shared sheet and enthesis interfaces are authored engineering approximations.",
    "Shoulder/supination fixed, skin absent; local tissue sag omitted."
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