{
  "chain_lengths": [3, 4, 5],
  "one_magnon_mode_numbers": [-1, 1],
  "four_site_sector": {
    "sites": 4,
    "down_spins": 2,
    "descendant_mode_numbers": [1, 2, 3],
    "regular_root_recipe": "opposite_one_over_two_sqrt3",
    "polynomial_probe": [0.37, 0.21],
    "negative_controls": ["omit_singular", "replace_singular_with_regular"]
  },
  "regular_bethe": {
    "on_shell_recipes": ["four_site_one_magnon", "five_site_dyadic_pair", "six_site_asymmetric_pair"],
    "probe_parameters": [[0.37, 0.21], [-0.42, 0.13], [0.0, 0.5]],
    "off_shell_cases": [
      {"sites": 4, "roots": [[0.27, 0.17]]},
      {"sites": 5, "roots": [[0.21, 0.17], [-0.61, 0.13]]}
    ],
    "energy_preserving_root_perturbation": 0.01,
    "minimum_regular_separation": 0.05,
    "minimum_vector_norm": 0.0001
  },
  "coupling_J": 1.0,
  "generic_spectral_pairs": [
    {"lambda": [0.37, 0.21], "mu": [-0.42, 0.13]},
    {"lambda": [1.2, -0.4], "mu": [-0.2, 0.6]}
  ],
  "exceptional_mu": [0.25, 0.125],
  "ybe_pairs": [
    {"a": [0.7, 0.23], "b": [-0.43, 0.19]},
    {"a": [-0.2, -0.6], "b": [1.1, 0.3]}
  ],
  "wrong_middle_increment": [0.25, -0.1],
  "equation_tolerance": 2e-12,
  "negative_control_minimum": 0.001,
  "saved_comparison": {"absolute_tolerance": 2e-12, "relative_tolerance": 1e-9}
}