\begin{table}%t3
\caption{Confidence intervals for different redshifts.}\label{table12}
%\centerline
 {\small \begin{tabular}{cccc}
\hline\hline
 $z$  &$\Delta z$ & Reported interval  & Confidence interval \\ 
 $(1)$ & $(2)$ &$(3)$ &$(4)$ \\ \hline
$  0.452$&$  0.78$&$ (-0.30,0.70)$&$ (-0.96,0.50)$ \\ 
 $  0.822$&$  0.21$&$ (-0.90,0.90)$&$ (-0.78,0.24)$ \\ 
 $  0.859$&$  0.23$&$ (-0.50,-0.10)$&$ (-0.80,0.34)$ \\ 
 $  0.873$&$  0.23$&$ (-0.20,0.20)$&$ (-0.62,0.43)$ \\ 
 $  0.908$&$  0.20$&$ (-0.80,0)$&$ (-0.74,0.25)$ \\ 
 $  0.942$&$  0.18$&$ (-1.90,-0.50)$&$ (-0.88,0.19)$ \\ 
 $  1.182$&$  0.27$&$ (-0.80,0.80)$&$ (-1.51,-0.20)$ \\ 
 $  1.243$&$  0.22$&$ (-0.20,0)$&$ (-1.18,-0.13)$ \\ 
 $  1.277$&$  0.27$&$  (0.,0.20)$&$ (-1.16,-0.20)$ \\ 
 $  1.348$&$  0.35$&$ (-1.00,-0.20)$&$ (-1.17,-0.31)$ \\ 
 $  1.439$&$  0.42$&$ (-0.50,0.50)$&$(-1.14,-0.41)$ \\ 
 $  1.541$&$  0.51$&$ (-0.20,0.20)$&$ (-1.08,-0.40)$ \\ 
 $  1.555$&$  0.48$&$ (-0.30,0.70)$&$ (-0.97,-0.21)$ \\ 
 $  1.636$&$  0.59$&$ (-0.50,0.90)$&$ (-1.21,-0.25)$ \\ 
 $  1.637$&$  0.59$&$  (0., 1.20)$&$(-1.21,-0.25) $ \\ 
 $  1.657$&$  0.60$&$ (-0.20,0.80)$&$(-1.16,-0.14)$ \\ 
 $  1.858$&$  0.49$&$  (0.,0.80)$&$ (-1.38,0.47) $ \\ 
 $  1.915$&$  0.38$&$  (0.50,1.10)$&$ (-1.33,0.76)$ \\ 
 $  2.022$&$  0.44$&$ (-0.50,0.30)$&$ (-1.72,0.69)$ \\ 
 $  2.168$&$  0.41$&$ (-0.40,0.40)$&$ (-1.41,0.78)$ \\ 
 $  2.185$&$  0.38$&$ (-0.10,0.50)$&$ (-1.33,0.91)$ \\ 
 $  2.187$&$  0.38$&$ (-0.40,0.)$&$ (-1.33,0.91)$ \\ 
 $  2.300$&$  0.389$&$ (-0.80,0)$&$ (-1.64,0.50) $ \\ 
\hline
\end{tabular}}
\medskip
 Notes:  Columns: $(1)$ redshift; $(2)$~length of the redshift   interval for which the confidence interval is calculated;  $(3)$~single value reported by \citet{Chand04}   in units of $10^{-5}$;  $(4)$ calculated confidence interval   from a group of data reported by \citet{Murphy03b}   in units of~$10^{-5}$. 
\end{table}