The TOPGöt high-mass star-forming sample - I. Methyl cyanide emission as tracer of early phases of star formation

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Table 2

Parameters of the K-ladder of CH₃CN(5−4).

ν	K_u	K_l	E_u	g_u	log(I∕[nm² MHz])
[MHz]			[K]
91 958.7263	4	4	123.2	22	−3.8674
91 971.1307	3	−3	73.2	22	−3.5450
91 971.1307	−3	3	73.2	22	−3.5450
91 979.9946	2	2	37.4	22	−3.3752
91 985.3144	1	1	16.0	22	−3.2861
91 987.0879	0	0	8.8	22	−3.2580

Notes. Frequency, quantum numbers K_u and K_l (K number of the upper and lower state, respectively, where the sign differentiate the A1 and A2 species for the K = 3 component), upper state energy E_u, degeneracy of the upper level g_u, and integrated intensity of the line at 300 K, I.

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