Table 2
Upper limits at the 3σ level on the disk-integrated CH3OH flux and CH3OH column density for various assumed excitation temperatures.
| Transition | v | Program | Spectrum rms |  |
 |
 |
 |
|---|---|---|---|---|---|---|---|
| (GHz) | (mJy) | (mJy km s−1) | at 100 K | at 168 K(a) | at 200 K | ||
| 3(−1,2)−2(−0,2) E | 310.1930 | 2022.1.00905.S | 1.0 | 10.4 | 15.6 | 16.0 | 16.1 |
| 6(1 ,5)−6(0,6) A | 311.8526 | 2017.1.01178.S | 6.1 | 63.6 | 15.7 | 16.0 | 16.1 |
| 2022.1.00905.S | 0.9 | 9.8 | 14.9 | 15.1 | 15.3 | ||
| 7(1,7)−6(1,6) A | 335.5820 | 2017.1.01178.S | 7.7 | 80.5 | 16.1 | 16.4 | 16.5 |
| 2019.1.00393.S | 6.0 | 62.6 | 16.0 | 16.3 | 16.4 | ||
| 7(1,6)−7(0,7) A | 314.8585 | 2017.1.01178.S | 6.6 | 69.0 | 15.7 | 16.0 | 16.1 |
| 7(−1,6)−6(−2,5) E | 313.5968 | 2022.1.00905.S | 1.0 | 10.5 | 15.8 | 16.0 | 16.1 |
| 9(1,8)−9(0,9) A | 322.2395 | 2017.1.01178.S | 12.8 | 133.9 | 16.0 | 16.2 | 16.3 |
| 2022.1.00905.S | 2.3 | 23.8 | 15.3 | 15.5 | 15.6 | ||
| 10(−0,10)−9(−1,8) E | 314.3511 | 2017.1.01178.S | 6.2 | 64.2 | 16.4 | 16.6 | 16.7 |
| 12(1,11)−12(0,12) A | 336.8651 | 2019.1.00393.S | 5.4 | 56.7 | 15.8 | 15.9 | 16.0 |
Notes. The columns list the quantum number of the imaged methanol transition, its frequency, the observational program covering the CH3OH line, the rms in the spectrum, the 3σ upper limit on the integrated line flux (assuming a line width of 10 km s−1), and the 3σ upper limit on the methanol column density 
for excitation temperatures of 100, 168, and 200 K. (a) The temperature of 168 K (within the likely interval of 100–200 K) corresponds to the rotational temperature found by Facchini et al. (2024) for the two water lines with the lowest Eu.
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