{
  "plate": "pi4146-47",
  "families": [
    {
      "offset_native": [
        66.07125238419621,
        3.685186896640971
      ],
      "catalog_pairs": 21,
      "models": [
        {
          "coordinate": "arithmetic_mean",
          "order": 1,
          "train": 15,
          "heldout": 6,
          "heldout_median_native": 2.202455344170531,
          "heldout_p90_native": 3.057361314627938,
          "training_median_native": 1.0422606128412228
        },
        {
          "coordinate": "brighter_component",
          "order": 1,
          "train": 15,
          "heldout": 6,
          "heldout_median_native": 21.914697418531635,
          "heldout_p90_native": 30.52570820745266,
          "training_median_native": 26.54669361178992
        },
        {
          "coordinate": "fainter_component",
          "order": 1,
          "train": 15,
          "heldout": 6,
          "heldout_median_native": 21.82252980356008,
          "heldout_p90_native": 29.11773295890334,
          "training_median_native": 27.765783463746658
        }
      ],
      "holdout_scope": "Entire exposure pairs held out; same catalog identities for all coordinate choices",
      "note": "This smaller, cleaner subset is not directly comparable to earlier full-sample residual summaries. Epoch proper motions remain uncorrected."
    }
  ],
  "interpretation": "Image duplication requires exposure-aware centroids before a physical distortion claim; no new model is installed by this diagnostic"
}