\begin{table}%t7
\caption{Confidence intervals for different redshifts.  }\label{table10}
%\centerline
 {\small \begin{tabular}{cccc}
\hline \hline
 $z$   & $\Delta z$& Reported interval  & Confidence interval  \\ 
 $(1)$ & $(2)$ &$(3)$ &$(4)$ \\ \hline
$  1.597$&$  0.53$&$(-2.92,1.72)$&$(-1.20,-0.32)$ \\ 
 $  1.908$&$  0.37$&$(0.92,15.08)$&$(-1.17,0.41)$ \\ 
 $  1.915$&$  0.36$&$(-18.34,6.74)$&$(-1.17,0.41)$ \\ 
 $  1.970$&$  0.34$&$(-6.74,24.34)$&$(-1.31,0.29)$ \\ 
 $  1.973$&$  0.33$&$(-2.64,2.04)$&$(-1.27,0.35)$ \\ 
 $  1.976$&$  0.33$&$(-10.60,10.00)$&$(-1.27,0.35)$ \\ 
 $  2.168$&$  0.26$&$(-2.39,3.39)$&$(-0.74,0.47)$ \\ 
 $  2.185$&$  0.25$&$(-2.60,1.00)$&$(-0.83,0.47)$ \\ 
 $  2.329$&$  0.32$&$(-13.44,2.24)$&$(-0.72,0.34)$ \\ 
 $  2.451$&$  0.28$&$(-0.92,2.92)$&$(-0.85,0.38)$ \\ 
 $  2.455$&$  0.29$&$(-6.07,2.07)$&$(-0.86,0.38)$ \\ 
 $  2.456$&$  0.29$&$(-4.83,5.23)$&$(-0.79,0.36)$ \\ 
 $  2.464$&$  0.31$&$(-1.08,3.08)$&$(-0.79,0.36)$ \\ 
 $  2.493$&$  0.26$&$(-1.09,10.49)$&$(-0.87,-0.04)$ \\ 
 $  2.828$&$  0.38$&$( -5.76,5.16)$&$(-0.50,0.74)$ \\
  \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{Chand05}    in units of $10^{-5}$; $(4)$ calculated confidence interval   from a group of data reported by  \citet{Murphy01b} 
  in units of~$10^{-5}$.
  \end{table}