\begin{table}%t3
%\centering
\par
\caption{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$\%.}
\small
\begin{tabular}{lrcrrcrrcrrcr} \hline\hline
Source & 340.035 & & & 340.031 & & & 340.019 & & & 340.008 & &  \\
 & $W$ & $\Delta V$ & $\tau$ & $W$ & $\Delta V$ & $\tau$ & $W$ & $\Delta V$ & $\tau$ & $W$ & $\Delta V$ & $\tau$ \\ \hline
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 & ... & ... \\ \hline 
\label{tobs1}
\end{tabular}
\end{table}