\begin{table}%t4
\caption{\label{table4c}Isotopic ratios in CN.}
\small%\centerline
 {
{
\begin{tabular}{lllll} 
\hline \hline  
&&&& \\[-8pt]
Runs & Comet & $^{12}$C/$^{13}$C &  $^{14}$N/$^{15}$N &Reference\\
\hline 
1  &   122P/de Vico &$         90\pm10 $&$ 145 \pm 20 $&{\it Jehin et~al. (\cite{jehin})}\\
2 & C/1996 B2 (Hyakutake) & ${\ge}60 $&${\ge}60  $\\
3 & C/1996 B2 (Hyakutake) & ${\ge}50 $&${\ge}50 $\\
4 &  C/1995 O1 (Hale-Bopp) &$80\pm 25 $&$ 130  \pm 40 $&{\it Manfroid et~al.  (\cite{manfroid})}\\
5 &  C/1995 O1 (Hale-Bopp) &$90\pm 20 $&$ 150 \pm 30$&{\it Manfroid et~al.  (\cite{manfroid})}\\
6 &  C/1995 O1 (Hale-Bopp) &$100\pm 30 $&$ 135 \pm 40 $&{\it Manfroid et~al.   (\cite{manfroid})}\\
7 & 55P/Tempel-Tuttle &$              - $&$  - $\\
8 & C/1999 H1 (Lee) &  ${\ge}60 $& ${\ge}60 $\\
9,10 & C/1999 S4 (LINEAR) &$          90\pm 30 $&$ 150 \pm 50 $&{\it Hutsem\'ekers et~al. (\cite{hutsemekers})} \\
11 & C/1999 T1 (McNaught-Hartley) &$  80\pm 20 $&$ 160 \pm 50$\\
12 & C/2001 A2-A (LINEAR) & ${\ge}60 $&${\ge}60 $\\
13, 14 & C/2000 WM1 (LINEAR) &$       100\pm 20 $&$ 150 \pm 30 $&{\it Arpigny et~al. (\cite{arpi}, \cite{arpib})}\\
15 & 153P/Ikeya-Zhang &$              80\pm 30 $&$ 140 \pm 50 $&{\it Jehin et~al. (\cite{jehin})}\\
17, 18 & C/2002 X5 (Kudo-Fujikawa) &$  90\pm 20 $&$ 130 \pm 20$\\
16, 19 & C/2002 V1 (NEAT) &$             100\pm 20 $&$ 160 \pm 35$\\
20 & C/2002 Y1 (Juels-Holvorcem) &$   90\pm 20 $&$ 150 \pm 35$\\
21 & C/2001 Q4 (NEAT) &$              70\pm 30 $&$ 130 \pm 40 $& Manfroid et~al.  (\cite{manfroid})\\
22, 23 &  88P/Howell  &$               90\pm 15 $&$ 140  \pm 20 $&Hutsem\'ekers et~al. (\cite{hutsemekers})\\
24 & C/2001 Q4 (NEAT) &$              90\pm 15 $&$ 135 \pm 20 $& Manfroid et~al.  (\cite{manfroid})\\
25, 28, 29 & C/2002 T7 (LINEAR) &$      85\pm 20 $&$ 160 \pm 25$\\
26 & C/2003 K4 (LINEAR)  &$           80\pm 20 $&$ 150 \pm 35 $&{\it Manfroid et~al.  (\cite{manfroid})}\\
30 & C/2003 K4 (LINEAR)  &$           90\pm 20 $&$ 145 \pm 25 $&{\it Manfroid et~al.  (\cite{manfroid})}\\
31, 34 & 9P/Tempel 1  &$              110\pm 20 $&$ 170 \pm 35 $&Jehin et~al. (\cite{jehina})\\
32, 33 & 9P/Tempel 1  &$               95\pm 15 $&$ 145 \pm 20 $&Jehin et~al. (\cite{jehina})\\
35 & 73P-B/Schwassmann-Wachmann 3 &$-$&$-$\\
36 & 73P-C/Schwassmann-Wachmann 3 &$-$&$-$\\
37 & 73P-B/Schwassmann-Wachmann 3 &$ 100\pm 30 $&$ 210 \pm 50$&Jehin et~al.  (\cite{jehinb})\\
38, 39 & 73P-C/Schwassmann-Wachmann 3 &$    100\pm 20 $&$ 220 \pm 40$&Jehin et~al.  (\cite{jehinb})\\
40 & C/2006 M4 (SWAN) &$              95\pm 25 $&$ 145 \pm 50$\\
41--44 & 17P/Holmes &$                 90\pm 20 $&$ 165 \pm 35$\\
41, 43, 44 & 17P/Holmes &${\ge}10 $&${\ge}10 $\\
42 & 17P/Holmes &$                    95\pm 20 $&$ 165 \pm 40$&Bockel\'ee-Morvan et~al.  (\cite{bockelee})\\
45 & 8P/Tuttle &$   90\pm 20  $&$ 150\pm 30 $&Bockel\'ee-Morvan et~al.  (\cite{bockeleeb})\\
46 & C/2007 N3 (Lulin) &$105\pm 40 $&$ 150 \pm 50 $\\
\hline
\end{tabular}}}
\medskip 
For convenience the data are grouped in observing runs as defined in Table~\ref{observcirc}. References are given when these are not first determinations, in italics if the values have been revised.
\end{table}