# Data layout

The `data/` tree is the Hugging Face-facing tabular interface. Each Parquet
file is independently readable and uses Zstandard compression.

- `tb_level/`: the primary table, split into P3 and P4 shards.
- `run_summary/`, `change_summary/`, `pair_metrics/`, `metric_summary/`:
  processed experiment summaries.
- `p1_*`: UE03 calibration tables.
- `p2_*`: three-UE anchor and crossing tables.
- `valid_pairs/`, `run_index/`, `block_manifest/`: relationship and provenance
  indexes.
- `terminals/`: non-identifying UE labels and model codes.

The same logical tables are available as sanitized CSV under
`../source/processed_csv/` and `../source/metadata/`.