**Table 4:** Line parameters for all absorption lines.
Line	$E_{\rm {u}}/k$	$n_{\rm {crit}}$	$\Delta v$
	[K]	[cm^-3]	[km s^-1]
NH₃(1, 1)	24	2.1e3	$1.4\pm 0.4$
NH₃(2, 2)	65	2.2e3	$2.0\pm 0.3$
CH₃OH (3_2,1-3_1,2)	36	1.0e4	$1.8\pm 0.1$
CH₃OH (4_2,2-4_1,3)	45	1.2e4	$2.1\pm 0.1$
CH₃OH (2_2,0-2_1,1)	29	0.8e4	$1.7\pm 0.1$
HCN(1-0)	4	2.6e6	$15.4\pm 0.3$

The NH₃ and CH₃OH data are from Beuther et al. (2005). The listed parameters are the upper level excitation energies $E_{\rm {u}}/k$ , the critical densities $n_{\rm {crit}}$ calculated at 60 K and the observed line widths of the absorption lines toward the UCH II region peak position.

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