Table 2: Gas temperature, non-thermal broadening and abundance of each molecule for the best-fit model. The peak opacity of each modeled transition is also given, as well as an estimation of the total opacity of the hyperfine multiplets if they had been modeled.
Molec. Line Frequency⁽¹⁾ $T_{\rm k}$ $\Delta V_{{\rm NT}}$ $\chi^{(2)}$ $\tau_{{\rm peak}}$ $\tau_{{\rm tot}}$

(MHz) (K) (km s^-1)

HCO⁺ 4-3 356734.134(50) 8.8 0.35 8.4(-10) 44 -

H¹³CO⁺ 4-3 346998.338(89) 8.8 0.35 1.2(-11) 0.46 -

DCO⁺ 4-3 288143.858(7) 8.8 0.35 2.1(-11) 1.2 -

5-4 360169.778(7) 0.25 -

N₂H⁺ 3-2 279511.858(11) 7.3 0.50 2.2(-10) 15 16

4-3 372672.560(13) 3.4 3.6

N₂D⁺ 4-3 308422.322(10) 7.3 0.50 2.5(-11) 0.49 0.51

o-H₂D⁺ 1₁₀-1₁₁ 372421.385(10) 8 0.50 4.3(-11) 0.19 -

⁽¹⁾
from the CDMS catalog as of Feb. 2006 (see Müller et al. 2005). The uncertainties
in parenthesis are given in units of the last digit.
⁽²⁾
X(p) means $X \times 10^{p}$ .

**Table 2:** Gas temperature, non-thermal broadening and abundance of each molecule for the best-fit model. The peak opacity of each modeled transition is also given, as well as an estimation of the total opacity of the hyperfine multiplets if they had been modeled.
Molec.	Line	Frequency⁽¹⁾	$T_{\rm k}$	$\Delta V_{{\rm NT}}$	$\chi^{(2)}$	$\tau_{{\rm peak}}$	$\tau_{{\rm tot}}$
		(MHz)	(K)	(km s^-1)
HCO⁺	4-3	356734.134(50)	8.8	0.35	8.4(-10)	44	-
H¹³CO⁺	4-3	346998.338(89)	8.8	0.35	1.2(-11)	0.46	-
DCO⁺	4-3	288143.858(7)	8.8	0.35	2.1(-11)	1.2	-
	5-4	360169.778(7)				0.25	-
N₂H⁺	3-2	279511.858(11)	7.3	0.50	2.2(-10)	15	16
	4-3	372672.560(13)				3.4	3.6
N₂D⁺	4-3	308422.322(10)	7.3	0.50	2.5(-11)	0.49	0.51
o-H₂D⁺	1₁₀-1₁₁	372421.385(10)	8	0.50	4.3(-11)	0.19	-

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