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Table 1
Original spatial resolution in parsecs for all (ALMA as well as PdBI) molecular transitions used in this paper.
| Transition | Spatial resolution | Average spatial resolution (pc) | Instrument |
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| CO (1–0) | 2″ × 1.1″ (140 pc × 77 pc) | 109 | PdB1 |
| CO (2–1) | 2″ × 1.1″ (140 pc × 77 pc) | 109 | PdB1 |
| CO (3–2) | 0.6″ × 0.5″ (42 pc × 35 pc) | 39 | ALMA Band 7 |
| CO (6–5) | 0.4″ × 0.2″ (28 pc × 14 pc) | 21 | ALMA Band 9 |
| HCO+ (1–0) high-res. | 2″ × 0.8″ (140 pc × 56 pc) | 98 | PdBI2 |
| HCO+ (1–0) low-res. | 6.6″ × 5.1″ (460 pc × 350 pc) | 405 | PdBI2 |
| HCO+ (4–3) | 0.6″ × 0.5″ (42 pc × 35 pc) | 39 | ALMA Band 7 |
| HCN(1–0) high-res. | 2″ × 0.8″ (140 pc × 56 pc) | 98 | PdBI2 |
| HCN(1–0) low-res. | 6.6″ × 5.1″ (460 pc × 350 pc) | 405 | PdBI2 |
| HCN (4–3) | 0.6″ × 0.5″ (42 pc × 35 pc) | 39 | ALMA Band 7 |
| CS (2–1) | 6.6″ × 3.2″ (462 pc × 224 pc) | 343 | PdBI3 |
| CS (7–6) | 0.6″ × 0.5″ (42 pc × 35 pc) | 39 | ALMA Band 7 |
Notes. We assume a distance of 14 Mpc. .
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