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Table 1
Spectral coverage of the ALMA observations.
| Setting | Frequency range | Resolution | rms noise | Beam |
| (GHz) | (MHz) | (mJy beam-1) | (“×”, PA) | |
|
|
||||
| 321 | 309.501−310.437 | 0.98 | 3 | 0.23 × 0.13,28.27° |
| 321 | 310.501−311.437 | 0.98 | 2 | 0.23 × 0.13,28.48° |
| 325 | 312.035−313.908 | 1.9 | 3 | 0.24 × 0.13,29.48° |
| 321 | 320.725−321.662 | 0.98 | 3 | 0.22 × 0.13,27.31° |
| 321 | 321.986−322.923 | 0.98 | 3 | 0.22 × 0.13,27.55° |
| 325 | 324.181−326.054 | 1.9 | 6 | 0.22 × 0.12,29.27° |
| 658 | 657.002−658.873 | 3.9 | 15 | 0.11 × 0.06,29.89° |
Notes. Setting names refer to those used for the released ALMA CSV data, focussing on the H2O masers at 321 GHz, 325 GHz, and 658 GHz.
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