\begin{table}%t6
\caption{Os and Ir abundances in {\cs}.}
\label{tab_osCS31}
%\centerline
{\begin{tabular}{ccll}
\hline\hline
$\lambda$ & Exc. pot. & $\log gf$ & $\log \epsilon^{a}$ \\
  (\AA)   & (eV)      &           &                 \\ 
\hline
Os I\\
\hline
3058.652 & 0.00 & $-$0.451       & 0.15 \\  
3267.945 & 0.00 & $-$1.080$^{d}$ & 0.20 \\  
3269.204 & 0.715& $-$1.070$^{c}$ & 0.2: \\  
3301.567 & 0.00 & $-$0.743       & 0.25 \\  
3504.662 & 0.52 & $-$1.636       & 0.2: \\  
3528.602 & 0.00 & $-$1.740       & 0.20 \\  
4135.775 & 0.52 & $-$1.260       & 0.60 \\
4260.848 & 0.00 & $-$1.440       & 0.21 \\
4420.468 & 0.00 & $-$1.530$^{d}$ & 0.5:$^b$ \\
\hline
Ir I\\
\hline
3513.648 & 0.00 & $-$1.246       &  0.19\\
3800.120 & 0.00 & $-$1.489       &  0.24\\
\hline
\end{tabular}}
\noindent $^a$ Abundance in the usual notation where $\log \epsilon$(H) = 12.\\
\noindent $^b$ Line heavily blended (see text).\\
\noindent $^c$ Experimental values rescaled by Kurucz (Bell heavy).\\
\noindent $^d$ Unscaled values from \citet{Kwiatkowski84}.\\
%mean = 0.28 +/-0.16 (9)
%mean_(no 4420 no 4135) = 0.20 +/-0.03 (7)
%mean_weighted = 0.28 +/-0.16 (9)
%mean_weighted(no 4135) = 0.22 +/-0.08 (8)
\end{table}