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Table 6
Tex derived from hyperfine fits to N2H+, C2H, HCN, and H13CN multiplets in four IRDCs.
| Species | G28.34 S | IRDC 18530a | IRDC 18306ab | IRDC 18308ab |
| (K) | (K) | (K) | (K) | |
| N2H+ (J = 1 → 0) | 5.81 ± 0.04 | 4.09 ± 0.21 | 3.62 ± 0.11 | 8.91 ± 0.94 |
| C2H (N = 1 → 0) | 3.14 ± 0.06 | 3.26 ± 0.17 | 3.01 ± 0.06 | 4.68 ± 0.98 |
| HCN (J = 1 → 0) | 15.10 ± 3.81 | 7.70 ± 0.55 | 2.82 ± 0.04∗ | 3.87 ± 0.34 |
| H13CN (J = 1 → 0) | 3.63 ± 0.23 | 3.35 ± 0.62∗ | 3.55 ± 0.62∗ ,† | 5.17 ± 2.42∗ ,† |
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