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Table 1
Summary of observations towards hot molecular core G31 used in this work.
| Telescope | Date | Phase center | Frequency coverage | θ beam | |
| RAJ2000 (h m s) | DecJ2000 (°′′′) | (GHz) | (″) | ||
|
|
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| IRAM 30 m | 1996 July | 18 47 34.4 | –01 12 46.0 | 86–2581 | 12−22 |
| 2014 Sep. | 18 47 34.3 | –01 12 45.9 | 81.2−89.0, 167.93−175.71 | 28, 14 | |
|
|
|||||
| GBT | 2011 May | 18 47 34.3 | –01 12 45.8 | 45.14−45.92 | 16 |
|
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|||||
| SMA | 2007 May | 18 47 34.3 | –01 12 45.9 | 219.45−221.45, 229.35−231.35 | 1.7 × 3.5 (comp.) |
| & July | 0.90 × 0.75 (very ext.+ comp.) | ||||
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