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| char | a | b | c | d |
|---|---|---|---|---|
| hydrogen enrichment parameter IH | 2.577 | 2.291 | 2.911 | 2.076 |
| aliphatic structural parameter IAL | 2.715 | 2.640 | 3.830 | 2.641 |
| aromatization degree parameter IAr | 1.049 | 0.862 | 1.074 | 0.732 |
| oxygen enrichment degree parameter IO2 | 13.518 | 10.639 | 14.164 | 8.714 |
