Table 4: Observed line fluxes ( $W=\int T_{\rm MB}~ {\rm d}V$ in K km s^-1), line widths ( $\Delta V$ in km s^-1) and opacities for the CN 3 $7\over 2$ -2 $5\over 2$ 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 were taken to be fixed with an estimated error of $\lesssim$ 30%.
Source 340.265 340.261 340.247

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

AFGL 2591 1.59(14) 2.6 0.06(1) 1.36(14) 2.7 0.05(1) 19.21(15) 3.3 0.55(1)

W3 IRS 5 1.66(33) 2.6 0.06(1) 1.48(13) 2.5 0.06(1) 20.68(37) 3.8 0.51(1)

IRAS 16293 <0.06 ... ... 0.08(2) 0.8 0.02(1) 2.01(11) 1.3 0.26(2)

N1333-I2 0.10(5) 0.9 0.01(<1) 0.11(5) 0.7 0.02(1) 1.29(5) 1.2 0.10(1)

N1333-I4A <0.09 ... ... <0.09 ... ... 1.01(6) 1.2 ...

L1448-C <0.06 ... ... 0.09(7) 1.1 0.01(<1) 1.28(7) 1.4 0.12(2)

L483 0.24(3) 1.1 0.02(1) 0.15(2) 1.1 0.01(<1) 2.78(3) 1.7 0.15(9)

L723 <0.06 ... ... <0.06 ... ... 1.03(3) 1.7 ...

SMM4 0.23(4) 2.2 0.01(<1) 0.22(4) 2.2 0.01(<1) 2.86(4) 2.8 0.10(2)

V1057 Cyg <0.07 ... ... <0.07 ... ... 0.85(3) 1.4 ...

L1489 <0.07 ... ... <0.07 ... ... 0.72(5) 3.6 ...

**Table 4:** Observed line fluxes ( $W=\int T_{\rm MB}~ {\rm d}V$ in K km s^-1), line widths ( $\Delta V$ in km s^-1) and opacities for the CN 3 $7\over 2$ -2 $5\over 2$ 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 were taken to be fixed with an estimated error of $\lesssim$ 30%.
Source	340.265			340.261			340.247
	W	$\Delta V$	$\tau$	W	$\Delta V$	$\tau$	W	$\Delta V$	$\tau$
AFGL 2591	1.59(14)	2.6	0.06(1)	1.36(14)	2.7	0.05(1)	19.21(15)	3.3	0.55(1)
W3 IRS 5	1.66(33)	2.6	0.06(1)	1.48(13)	2.5	0.06(1)	20.68(37)	3.8	0.51(1)
IRAS 16293	<0.06	...	...	0.08(2)	0.8	0.02(1)	2.01(11)	1.3	0.26(2)
N1333-I2	0.10(5)	0.9	0.01(<1)	0.11(5)	0.7	0.02(1)	1.29(5)	1.2	0.10(1)
N1333-I4A	<0.09	...	...	<0.09	...	...	1.01(6)	1.2	...
L1448-C	<0.06	...	...	0.09(7)	1.1	0.01(<1)	1.28(7)	1.4	0.12(2)
L483	0.24(3)	1.1	0.02(1)	0.15(2)	1.1	0.01(<1)	2.78(3)	1.7	0.15(9)
L723	<0.06	...	...	<0.06	...	...	1.03(3)	1.7	...
SMM4	0.23(4)	2.2	0.01(<1)	0.22(4)	2.2	0.01(<1)	2.86(4)	2.8	0.10(2)
V1057 Cyg	<0.07	...	...	<0.07	...	...	0.85(3)	1.4	...
L1489	<0.07	...	...	<0.07	...	...	0.72(5)	3.6	...

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