{
  "schema_version": 1,
  "scope": "Fixed exact arithmetic fixtures for Sections 1-8 and Appendix A",
  "flat_weights": [
    {"id": "n4-equal", "mu": ["1/2", "1/2", "1/2", "1/2"]},
    {"id": "n4-printed", "mu": ["0.3", "0.4", "0.6", "0.7"]},
    {"id": "n4-perturbed-1-10", "mu": ["2/5", "2/5", "3/5", "3/5"]},
    {"id": "n4-perturbed-1-100", "mu": ["49/100", "49/100", "51/100", "51/100"]},
    {"id": "n5-equal", "mu": ["2/5", "2/5", "2/5", "2/5", "2/5"]},
    {"id": "n5-asymmetric", "mu": ["1/5", "3/10", "2/5", "1/2", "3/5"]}
  ],
  "f_curve_probes": [
    {"id": "n6-equal-3111", "mu": ["1/3", "1/3", "1/3", "1/3", "1/3", "1/3"], "parts": [[0, 1, 2], [3], [4], [5]]},
    {"id": "n6-equal-2211", "mu": ["1/3", "1/3", "1/3", "1/3", "1/3", "1/3"], "parts": [[0, 1], [2, 3], [4], [5]]},
    {"id": "n6-asymmetric-2211", "mu": ["1/10", "1/5", "3/10", "2/5", "9/20", "11/20"], "parts": [[0, 4], [1, 5], [2], [3]]}
  ],
  "sl2_fixtures": [
    {"id": "integer-noncommuting", "A": [["1", "1"], ["0", "1"]], "B": [["1", "0"], ["1", "1"]], "C": [["1", "2"], ["1", "3"]], "chart_nondegenerate": true},
    {"id": "rational-noncommuting", "A": [["3/2", "1/2"], ["1", "1"]], "B": [["1", "1/3"], ["3", "2"]], "C": [["1", "-2"], ["1", "-1"]], "chart_nondegenerate": true},
    {"id": "identity-chart-degeneracy", "A": [["1", "0"], ["0", "1"]], "B": [["1", "1"], ["0", "1"]], "C": [["1", "0"], ["1", "1"]], "chart_nondegenerate": false}
  ]
}