Table 7: Inferred inner abundances $x_{\rm 100~K}$ from jump models assuming the emission to come from the region with $T\gtrsim 100$ K. The average temperature $T_{\rm av}$ , hydrogen density $n_{\rm H,~ av}$ and size (radius) of the inner 100 K region are also given.
Source $T_{\rm av}$ (K) $n_{\rm H,~ av}$ (cm^-3) Radius (AU) CN NO CO⁺ SO⁺

AFGL 2591 170 $4\times 10^6$ 1100 $6\times 10^{-07}$ $3\times 10^{-06}$ $1\times 10^{-09}$ $2\times 10^{-09}$

W3 IRS 5 210 $1\times 10^7$ 5400 $1\times 10^{-08}$ $2\times 10^{-07}$ $7\times 10^{-11}$ $9\times 10^{-10}$

IRAS 16293 160 $1\times 10^9$ 100 $3\times 10^{-09}$ ... $6\times 10^{-11}$ $\lesssim$ $1\times 10^{-10}$

**Table 7:** Inferred inner abundances $x_{\rm 100~K}$ from jump models assuming the emission to come from the region with $T\gtrsim 100$ K. The average temperature $T_{\rm av}$ , hydrogen density $n_{\rm H,~ av}$ and size (radius) of the inner 100 K region are also given.
Source	$T_{\rm av}$ (K)	$n_{\rm H,~ av}$ (cm^-3)	Radius (AU)	CN	NO	CO⁺	SO⁺
AFGL 2591	170	$4\times 10^6$	1100	$6\times 10^{-07}$	$3\times 10^{-06}$	$1\times 10^{-09}$	$2\times 10^{-09}$
W3 IRS 5	210	$1\times 10^7$	5400	$1\times 10^{-08}$	$2\times 10^{-07}$	$7\times 10^{-11}$	$9\times 10^{-10}$
IRAS 16293	160	$1\times 10^9$	100	$3\times 10^{-09}$	...	$6\times 10^{-11}$	$\lesssim$ $1\times 10^{-10}$

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