{
  "a": 0.25108023173965627,
  "b": 0.15527128085684205,
  "posterior_cov": [
    [
      0.44428360710170717,
      -0.11671695467952665
    ],
    [
      -0.11671695467952667,
      0.8522848056299932
    ]
  ]
}