{
  "edition": "0.3.2",
  "entities": {
    "preview_map": {
      "file": "Original source member path.",
      "model": "Observed, LDEO1 or LDEO2; names are not a verified model-version ranking.",
      "lead_months": "3,6,9,12 for model composites; null for observations. Not a verified issuance date.",
      "target_month": "YYYY-MM verification month.",
      "monthtime": "Original half-integer numeric T, months since January 1960.",
      "longitude": "42 cell centres, 124..288 degrees east in 4-degree increments.",
      "latitude": "30 cell centres, -29..29 degrees north in 2-degree increments.",
      "values_row_major_y_x": "1260 values, Y south to north then X eastward; null for source -999 or nonfinite; round source floats to 3 decimals.",
      "units": "Sea-surface temperature anomaly in degrees Celsius; reference period unverified.",
      "valid_cells": "Count of nonmissing displayed cells; not a model skill or confidence score."
    },
    "slice_receipt": {
      "slice_id": "Local stable identifier for model,target,lead; not a DOI.",
      "source_member_sha256": "SHA-256 of the unchanged source file.",
      "issue_timestamp": "Null; no issue receipt in inspected files.",
      "record_type": "OBSERVATION, RETROSPECTIVE (chronology inference for 1982), or ISSUE_TIME_UNVERIFIED.",
      "record_type_evidence": "Separates observed file identity from inferred chronology and unknown timing.",
      "anomaly_reference_period": "Unknown until original product documentation establishes it."
    },
    "coverage": {
      "target_months": "All actual source T coordinates, mapped to month labels; continuity checked.",
      "valid_cells_by_target": "Source nonmissing-cell counts for every target month.",
      "forecast_observation_overlap": "Matching target coordinates plus pairwise valid-cell masks; not forecast skill.",
      "all_core_common_targets": "Intersection of target-coordinate sets across all nine files; not verified real-time availability."
    },
    "evidence_ledger": {
      "id": "E1..E10",
      "claim": "A statement about what the fields are or when they were made.",
      "status": "VERIFIED_LOCALLY, DOCUMENTED, INFERRED, UNVERIFIED or UNKNOWN; compound statuses separate what a source documents from whether it applies to the archive.",
      "evidence": "Source, URL and a short quotation where available.",
      "limits": "What the evidence does not show.",
      "candidate_receipts": "Contemporaneous documents that could support or refute issue timing; not yet compared."
    }
  },
  "unresolved": [
    "Anomaly reference period",
    "Correspondence of archive LDEO1/LDEO2 labels to the bulletins' original and improved initializations",
    "Exact initialization dates",
    "Exact issuance times",
    "LDEO1/LDEO2 product differences",
    "Lead convention of the archived composites",
    "Observation revision/vintage history",
    "Training and post-processing evaluation separation"
  ],
  "missing_value_policy": "Source -999/nonfinite becomes JSON null. Unknown provenance remains explicitly unknown, never zero."
}