Table 5: Observed line fluxes ( $W=\int T_{\rm MB}~ {\rm d}V$ in K km s^-1) and line widths ( $\Delta V$ in km s^-1) for the NO, CO⁺ and SO⁺ transitions. The frequencies are given in GHz. Upper limits are at $3\sigma$ in line flux. Numbers in brackets are uncertainties in units of the the last decimal place. The hyperfine line widths of NO were taken to be fixed with an estimated error of $\lesssim$ 30%.
Source NO NO CO⁺ CO⁺ SO⁺

351.043 351.051 353.741 354.014 347.740

W $\Delta V$ $\tau$ W $\Delta V$ $\tau$ W $\Delta V$ W $\Delta V$ W $\Delta V$

AFGL 2591 0.99(6) 4.1 0.28(2) 1.30(6) 4.1 0.21(1) 0.50(6) 4.0(6) 0.27(3) 4.0^a 0.40(3) 5.1(5)

W3 IRS 5 1.79(5) 4.7 0.37(9) 2.21(5) 4.7 0.30(7) 0.82(4) 3.6(5) 0.37(4) 3.6^a 3.59(10) 4.5(6)

IRAS 16293 ... ... ... ... ... ... 0.31(4) 2.9^a 0.21(7) 2.7(6) $\lesssim$ 0.17 ...

N1333-I2 0.10(2) 0.9 0.01(1) 0.10(2) 0.9 0.01(1) $\lesssim$ 0.09 1.9 <0.05 ... <0.04 ...

N1333-I4A 0.13(2) 0.9 0.01(1) 0.24(2) 1.5 0.01(1) <0.06 ... <0.06 ... <0.04 ...

L1448-C ... ... ... ... ... ... <0.05 ... <0.05 ... <0.04 ...

L483 ... ... ... ... ... ... <0.04 ... <0.04 ... ... ...

L723 ... ... ... ... ... ... <0.05 ... <0.05 ... <0.07 ...

SMM4 ... ... ... ... ... ... <0.05 ... <0.05 ... <0.07 ...

V1057 Cyg ... ... ... ... ... ... <0.05 ... <0.05 ... <0.07 ...

^a The line width was taken to be fixed due to the noisy spectrum.

**Table 5:** Observed line fluxes ( $W=\int T_{\rm MB}~ {\rm d}V$ in K km s^-1) and line widths ( $\Delta V$ in km s^-1) for the NO, CO⁺ and SO⁺ transitions. The frequencies are given in GHz. Upper limits are at $3\sigma$ in line flux. Numbers in brackets are uncertainties in units of the the last decimal place. The hyperfine line widths of NO were taken to be fixed with an estimated error of $\lesssim$ 30%.
Source	NO			NO			CO⁺		CO⁺		SO⁺
	351.043			351.051			353.741		354.014		347.740
	W	$\Delta V$	$\tau$	W	$\Delta V$	$\tau$	W	$\Delta V$	W	$\Delta V$	W	$\Delta V$
AFGL 2591	0.99(6)	4.1	0.28(2)	1.30(6)	4.1	0.21(1)	0.50(6)	4.0(6)	0.27(3)	4.0^a	0.40(3)	5.1(5)
W3 IRS 5	1.79(5)	4.7	0.37(9)	2.21(5)	4.7	0.30(7)	0.82(4)	3.6(5)	0.37(4)	3.6^a	3.59(10)	4.5(6)
IRAS 16293	...	...	...	...	...	...	0.31(4)	2.9^a	0.21(7)	2.7(6)	$\lesssim$ 0.17	...
N1333-I2	0.10(2)	0.9	0.01(1)	0.10(2)	0.9	0.01(1)	$\lesssim$ 0.09	1.9	<0.05	...	<0.04	...
N1333-I4A	0.13(2)	0.9	0.01(1)	0.24(2)	1.5	0.01(1)	<0.06	...	<0.06	...	<0.04	...
L1448-C	...	...	...	...	...	...	<0.05	...	<0.05	...	<0.04	...
L483	...	...	...	...	...	...	<0.04	...	<0.04	...	...	...
L723	...	...	...	...	...	...	<0.05	...	<0.05	...	<0.07	...
SMM4	...	...	...	...	...	...	<0.05	...	<0.05	...	<0.07	...
V1057 Cyg	...	...	...	...	...	...	<0.05	...	<0.05	...	<0.07	...

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