```json { "table_name": "neal_reading_groups", "table_type_tags": [ {"tag": "dimension", "confidence": 0.75} ], "primary_type": "dimension", "insufficient_evidence": false, "entity": { "columns": ["reading_id", "rank"], "unique_per_row": true }, "time_axis": null, "reasoning": "The composite entity (reading_id, rank) is unique per row: reading_id has RPUV 3.67 and rank has 4 distinct values, yielding ~240 combinations for 220 rows. Each row describes a ranked group breakdown for a reading (label + value pairs, with rank ordering the top groups). No time axis exists — the provenance columns are synthetic. The table catalogs the composition of each reading's groups, making it dimension." } ```