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| sample composition (x value) | QE, % |
|---|---|
| 0 | 22.6 ± 1.0 |
| 0.05 | 20.6 ± 0.5 |
| 0.1 | 16.1 ± 1.0 |
| 0.15 | 18.2 ± 1.0 |
| ≥0.2 | low, not measured |
