{
  "fixed_heads": [
    4206,
    13406
  ],
  "equal_gain_anchor": 1446,
  "changed_anchor_tests": [
    {
      "anchor_shift": -1,
      "balance": -10
    },
    {
      "anchor_shift": 0,
      "balance": 0
    },
    {
      "anchor_shift": 1,
      "balance": 10
    },
    {
      "anchor_shift": 40,
      "balance": 400
    }
  ],
  "law": "With heads fixed and anchor increased by h,3C\u221213R changes by10h. Translating all three dates together preserves both radii.",
  "scope": "The equation conditionally identifies an arithmetic anchor; the source independently assigns Exodus1446 its role."
}