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The geographical origin and number of samples for the investigated black teas.
| Code | Sampling Region | Number (Representatives) |
|---|---|---|
| CH | China | 6 |
| JA | Japan | 6 |
| K | Kenya | 6 |
| IR | Iran | 6 |
| NH | Nepal (border of the Darjeeling region, altitude >2000 m) | 6 |
| NM | Nepal (altitude 1500–1700 m) | 6 |
| I | India (Assam region) | 6 |
| S | Sri Lanka | 6 |
