Table 3: 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 $5\over 2$ -2 $3\over 2$ 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 line width was taken to be fixed with an estimated error of $\lesssim$ 30%.
Source 340.035 340.031 340.019 340.008

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

AFGL 2591 7.71(14) 2.7 0.27(3) 8.39(14) 2.7 0.29(3) 1.40(13) 2.7 0.05(1) 1.49(20) 2.7 0.05(1)

W3 IRS 5 8.34(22) 3.1 0.25(5) 9.04(22) 3.1 0.27(5) 1.52(20) 3.1 0.05(1) 1.36(20) 3.1 0.04(1)

IRAS 16293 1.14(7) 1.2 0.52(5) 0.92(6) 1.0 0.53(5) 0.12(5) 1.0 0.10(1) <0.06 ... ...

N1333-I2 0.61(4) 1.0 0.06(1) 0.59(4) 1.0 0.06(1) 0.16(4) 0.8 0.02(1) <0.10 ... ...

N1333-I4A 0.38(4) 1.2 0.09(1) 0.31(4) 0.9 0.08(1) <0.09 ... ... <0.09 ... ...

L1448-C 0.46(2) 1.1 0.12(1) 0.45(2) 1.1 0.12(1) 0.06(2) 1.1 0.02(<1) 0.06(2) 1.1 0.01(<1)

L483 1.21(10) 1.3 0.09(1) 1.28(10) 1.3 0.09(1) 0.19(10) 1.2 0.01 0.20(10) 1.0 0.02(<1)

L723 0.36(3) 1.4 0.03(<1) 0.40(3) 1.3 0.03(<1) <0.06 ... ... <0.06 ... ...

SMM4 1.36(4) 3.0 0.05(2) 0.98(4) 2.5 0.05(2) 0.22(5) 2.2 0.01(<1) 0.16(4) 2.0 0.01(<1)

V1057 Cyg 0.29(3) 1.1 0.11(2) 0.31(3) 1.2 0.11(2) <0.07 ... ... <0.07 ... ...

L1489 0.28(5) 1.1 0.01(<1) 0.21(5) 1.1 0.01(<1) <0.07 ... ... <0.07 ... ...

**Table 3:** 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 $5\over 2$ -2 $3\over 2$ 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 line width was taken to be fixed with an estimated error of $\lesssim$ 30%.
Source	340.035			340.031			340.019			340.008
	W	$\Delta V$	$\tau$	W	$\Delta V$	$\tau$	W	$\Delta V$	$\tau$	W	$\Delta V$	$\tau$
AFGL 2591	7.71(14)	2.7	0.27(3)	8.39(14)	2.7	0.29(3)	1.40(13)	2.7	0.05(1)	1.49(20)	2.7	0.05(1)
W3 IRS 5	8.34(22)	3.1	0.25(5)	9.04(22)	3.1	0.27(5)	1.52(20)	3.1	0.05(1)	1.36(20)	3.1	0.04(1)
IRAS 16293	1.14(7)	1.2	0.52(5)	0.92(6)	1.0	0.53(5)	0.12(5)	1.0	0.10(1)	<0.06	...	...
N1333-I2	0.61(4)	1.0	0.06(1)	0.59(4)	1.0	0.06(1)	0.16(4)	0.8	0.02(1)	<0.10	...	...
N1333-I4A	0.38(4)	1.2	0.09(1)	0.31(4)	0.9	0.08(1)	<0.09	...	...	<0.09	...	...
L1448-C	0.46(2)	1.1	0.12(1)	0.45(2)	1.1	0.12(1)	0.06(2)	1.1	0.02(<1)	0.06(2)	1.1	0.01(<1)
L483	1.21(10)	1.3	0.09(1)	1.28(10)	1.3	0.09(1)	0.19(10)	1.2	0.01	0.20(10)	1.0	0.02(<1)
L723	0.36(3)	1.4	0.03(<1)	0.40(3)	1.3	0.03(<1)	<0.06	...	...	<0.06	...	...
SMM4	1.36(4)	3.0	0.05(2)	0.98(4)	2.5	0.05(2)	0.22(5)	2.2	0.01(<1)	0.16(4)	2.0	0.01(<1)
V1057 Cyg	0.29(3)	1.1	0.11(2)	0.31(3)	1.2	0.11(2)	<0.07	...	...	<0.07	...	...
L1489	0.28(5)	1.1	0.01(<1)	0.21(5)	1.1	0.01(<1)	<0.07	...	...	<0.07	...	...

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