A study of submillimeter methanol absorption toward PKS 1830−211: - Excitation, invariance of the proton-electron mass ratio, and systematics

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Table 1.

Summary of the observations.

Tuning	Freq. ^(a)	Date	N_ant^(b)	B_min^(c)	B_max^(c)	PWV ^(d)	t_on^(e)	δv^(f)	σ^(g)	Beam
	(GHz)			(m)	(km)	(mm)	(min)	(km s⁻¹)	(10⁻³)	(mas)
B4a	154.9	2019 Jul 10	45	138	13.9	2.1	7:36	1.0	1.4	50
B6	230.7	2019 Jul 11	44	111	12.6	1.2	24:52	1.2	1.2	30
B5	181.6	2019 Jul 28	43	92	8.5	0.6	17:14	1.6	1.7	60
B7	283.4	2019 Jul 28	42	92	8.5	0.6	18:49	1.1	1.1	30
B4b	154.9	2019 Aug 17	47	41	3.6	1.0	7:37	1.0	1.0	180

Notes.

^(a)

Frequency of the local oscillator between the lower and upper sidebands;

^(b)

number of antennas in the array;

^(c)

v_min, B_max: minimum and maximum projected baselines, respectively;

^(d)

amount of precipitable water vapor in the atmosphere;

^(e)

total on-source integration time;

^(f)

velocity resolution, after Hanning smoothing;

^(g)

rms noise normalized to the continuum level.

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