Table 1. Observed line parameters for CH₃CO⁺ in TMC-1.

Ju	K	$v_{obs}^a$ (MHz)	$\text{Δ}{v}_{oc}^b$ (kHz)	${\text{T}}_A^{\ast c}$ (mK)	Δvd (kms−1)	${{\displaystyle \int }}^{\text{}}{\text{T}}_A^{\ast }{\text{dv}}^e$ (mK km s−1)
2	0	36537.765	-3.5	39.O±O.6	0.63±0.01	26.1±0.6
2	1	36537.014	-0.6	11.8±O.6	0.60±0.03	7.5±0.6
4	0	73074.769	2.7	71.0±3.5	0.47±0.03	35.7±2.0
4	1	73073.252	-6.6	25.0±3.5	0.65±0.11	17.2±2.0
5	0	91342.732	-3.5	37.5±3.0	0.46±0.04	18.2±1.0
5	1	91340.865	14.2	11.9±3.0	0.49±0.11	6.3±1.0
6	0	109610.225	2.1	12.8±2.8	0.45±0.09	6.1±1.0
6	1	109607.954	-7.3	6.6±2.8	0.60±0.10	4.2±1.0

Notes.

^aObserved frequencies (in MHz) adopting a v_LSR of 5.83 km s⁻¹ for TMC-1. The uncertainty is 10 kHz for all the lines.

^bObserved minus calculated frequencies (in kHz) resulting from a fit to the observed frequencies. The J=7-6 K=0,1 lines observed in L1527 have been included in the fit (see text).

^cAntenna temperature (in mK).

^dLinewidth at half intensity (in kms⁻¹). ^(e) Integrated line intensity (in mKkms⁻¹).