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| sample ID | relative content of carbon (%) | relative content of oxygen (%) | O/C (atom %) |
|---|---|---|---|
| LTS | 53.76 | 43.75 | 81.38 |
| JLS-3 | 65.66 | 32.29 | 49.18 |
| SH | 67.58 | 30.55 | 45.21 |
| PM2 | 77.68 | 19.02 | 24.49 |
| HB6-3 | 80.64 | 16.74 | 20.76 |
| DY | 81.5 | 16.4 | 20.12 |
