Table 1.

Spectroscopic information (rest frequency, Einstein coefficients [$A_{\mathrm{u}\mathrm{l}}$], and energy of the upper levels [$E_{\mathrm{u}\mathrm{p}}$]) of the 14 unblended or slightly blended rotational transitions of EtA detected toward the G+0.693 molecular cloud (shown in Fig. 2)

Frequency, GHz	Transition	log$A_{\mathrm{u}\mathrm{l}}$, ${\mathrm{s}}^{-1}$	$E_{\mathrm{u}\mathrm{p}}$, K
39.7379429	4(0,4)–3(0,3)	−5.64603	4.8
40.4083769	4(2,3)–3(2,2)	−5.74549	6.7
41.1366268	4(2,2)–3(2,1)	−5.72208	6.7
42.2557255	4(1,3)–3(1,2)	−5.59088	5.5
49.1932727	5(0,5)–4(0,4)	−5.35979	7.2
73.0048603	7(1,6)–6(1,5)	−4.84093	14.6
76.6071016	8(0,8)–7(0,7)	−4.76916	16.9
80.0223886	8(2,7)–7(2,6)	−4.73500	19.2
82.8757878	8(1,7)–7(1,6)	−4.67140	18.6
84.2912932	8(2,6)–7(2,5)	−4.66443	19.8
89.7254251	9(2,8)–8(2,7)	−4.57750	23.5
91.6032870	9(3,7)–8(3,6)	−4.57780	26.0
91.8301065	9(4,5)–8(4,4)	−4.61854	29.2
94.7010488	10(0,10)–9(0,9)	−4.48695	25.5