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| System | Absolute enhancement |
| 9% benzene/C6D6/nitroxide (I) | –67 ± 15 |
| 9% benzene/SF CO2/nitroxide (I) | –205 ± 24 |
| 9% benzene/C6D6/nitroxide (II) | –61 ± 17 |
| 9% benzene/SF CO2/nitroxide (II) | –246 ± 36 |
