{
  "source_indices": "Indices in the original LCS alignment annotation list, reconstructed from each canonical manifest.",
  "row_index": "Row in the combined 10,000 sample table.",
  "block_row_index": "Row in its 5,000-sample feature block.",
  "legacy_indices_npy": "Historical indices_n5000 / indices_new5000 files contain 0..4999 block row positions, not source annotation indices."
}