O/C ratios obtained by XPS.
| Sample | O/C |
|---|---|
| AHP-EFB | 0.88 |
| EFB-TOCN | 0.83 |
| TOCN 30-1:8 | 0.64 |
| TOCN 60-1:8 | 0.76 |
| TOCN 90-1:8 | 0.74 |
| TOCN 120-1:8 | 0.92 |
| TOCN 120-1:1 | 0.72 |
| TOCN 120-1:5 | 0.69 |
| TOCN 120-1:10 | 0.68 |
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