**Table 1:** NH₃ line parameters $^{\rm a)}$ .
Line	$\int{\tau {\rm d}V}$	V	$\Delta V_{1/2}$
	(km s^-1)
NH₃ (1, 1)	0.661 (0.120)	+9.0 (0.1)	27.3	(0.3)
	0.895 (0.164)	+8.6 (0.5)	34.9	(1.2)
NH₃ (2, 2)	0.599 (0.109)	+7.4 (0.2)	33.6	(0.5)
	0.429 (0.082)	+10.5 (0.4)	20.8	(1.0)
NH₃ (3, 3)	0.330 (0.050)	+8.6 (0.1)	15.6	(0.3)
NH₃ (4, 4)	0.137 (0.021)	+8.4 (0.2)	17.3	(0.4)
	0.105 (0.022)	+9.1 (0.7)	14.7	(1.7)
NH₃ (5,5)	0.101 (0.016)	+8.3 (0.3)	16.9	(0.6)
	0.101 (0.017)	+8.7 (0.5)	20.6	(1.3)
NH₃ (6, 6)	0.111 (0.017)	+8.1 (0.2)	20.4	(0.6)
	0.091 (0.040)	+8.5 (0.6)	14.8	(1.4)
NH₃ (7, 7)	0.035 (0.006)	+10.9 (0.4)	13.4	(0.9)
NH₃ (8, 8)	0.029 (0.006)	+8.5 (0.6)	14.8	(1.4)
NH₃ (9, 9)	0.037 (0.007)	+8.8 (0.7)	20.7	(1.6)
NH₃ (10, 10)	0.024 (0.005)	+10.2 (2.0)	36.9	(5.0)

$^{\rm a)}$ From Gaussian fits adopting z=0.88 582 and assuming that the continuum source covering factor is $f_{\rm c} = 1$ . Standard deviations are given in parentheses. In cases in which a line was measured twice, the upper line refers to data taken in 2003 (see Sect. 2). The errors in the integrated optical depths include a 15% calibration uncertainty, a 10% uncertainty due to interference in the (1, 1) and (2, 2) spectra, and the standard deviation from the Gaussian fit. For V and $\Delta V_{1/2}$ , standard deviations were obtained from Gaussian fits alone.

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