Table 4: Temperature and column density estimates. $\theta _{\rm s}$ and D are the angular and linear source diameter, respectively. $T_{\rm k}$ is the kinetic temperature, and $N_{\rm tot}$ the total column density of the corresponding molecular species.
Tracer $\theta _{\rm s}$ D $T_{\rm k}$ $N_{\rm tot}$

( $^{\prime \prime }$ ) (pc) (K) (cm^-2 )

CH₃C₂H (PdBI) 1.4 0.033 42 $\pm$ 1 $(1.8\pm0.2) \times 10^{14}$

NH₃ (VLA) $\sim$ 5 0.12 26 $\pm$ 6 $\sim$ $6 \pm 2 \times 10^{15}$

CH₃C₂H (30 m)^* 18 0.43 34 $\pm$ 6 $(5\pm0.2) \times 10^{15}$

C¹⁷O (30 m)^* 15 0.35 15 $\pm$ 5 $\sim$ $4 \pm 2 \times 10^{15}$

^* Corrected for source size.

**Table 4:** Temperature and column density estimates. $\theta _{\rm s}$ and D are the angular and linear source diameter, respectively. $T_{\rm k}$ is the kinetic temperature, and $N_{\rm tot}$ the total column density of the corresponding molecular species.
Tracer	$\theta _{\rm s}$	D	$T_{\rm k}$	$N_{\rm tot}$
	( $^{\prime \prime }$ )	(pc)	(K)	(cm^-2 )
CH₃C₂H (PdBI)	1.4	0.033	42 $\pm$ 1	$(1.8\pm0.2) \times 10^{14}$
NH₃ (VLA)	$\sim$ 5	0.12	26 $\pm$ 6	$\sim$ $6 \pm 2 \times 10^{15}$
CH₃C₂H (30 m)^*	18	0.43	34 $\pm$ 6	$(5\pm0.2) \times 10^{15}$
C¹⁷O (30 m)^*	15	0.35	15 $\pm$ 5	$\sim$ $4 \pm 2 \times 10^{15}$

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