\begin{table}%t5
\caption{Confidence intervals for different redshifts.}\label{table8}
%\centerline
 {\small 
\begin{tabular}{cccc}
\hline
\hline
 $z$   & $\Delta z$ & Reported interval  & Confidence interval  \\ 
 $(1)$ & $(2)$ &$(3)$ &$(4)$ \\
  \hline
 $  2.01$&$  0.41$&$(-1.04,0.28)$&$(-1.72,0.68)$ \\ 
 $  2.06$&$  0.44$&$(-2.13,1.23)$&$(-1.57,0.81)$ \\ 
 $  2.12$&$  0.40$&$(-1.09,0.39)$&$(-1.43,0.88)$ \\ 
 $  2.14$&$  0.37$&$(-2.56,-0.02)$&$(-1.39,0.82)$ \\ 
 $  2.20$&$  0.40$&$(-1.26,0.08)$&$(-1.33,0.91)$ \\ 
 $  2.28$&$  0.37$&$(0.44,1.64)$&$(-1.56,0.39)$ \\ 
 $  2.30$&$  0.39$&$(-1.03,0.43)$&$(-1.64,0.49)$ \\ 
 $  2.31$&$  0.41$&$(-0.14,1.94)$&$(-1.64,0.50)$ \\ 
 $  2.46$&$  0.33$&$(-0.81,-0.09)$&$(-1.52,0.36)$ \\ 
 $  2.53$&$  0.44$&$(-0.27,1.03)$&$(-1.44,0.38)$ \\
 $  2.62$&$  0.38$&$(-0.90,-0.30)$&$(-1.55,0.23)$ \\ 
 $  2.64$&$  0.40$&$(-1.04,1.08)$&$(-1.14,0.52)$ \\ 
 $  2.77$&$  0.51$&$(0.70,2.10)$&$(-1.63,0.61)$ \\ 
 $  2.81$&$  0.54$&$(-0.44,1.04)$&$(-1.63,0.61)$ \\ 
 $  2.85$&$  0.60$&$(-0.14,0.66)$&$(-1.58,0.67)$ \\ 
 $  2.90$&$  0.69$&$(-2.18, 0.)$&$( -1.48,0.69)$ \\ 
 $  2.91$&$  0.71$&$(-0.67,1.33)$&$(-1.48,0.69)$ \\ 
 $  2.98$&$  0.82$&$(-1.35,2.19)$&$(-1.97,0.59)$ \\ 
 $  3.02$&$  0.84$&$(-1.08,0.28)$&$(-1.97,0.59)$ \\
  \hline
\end{tabular}}
\medskip
Notes. Column: $(1)$ redshift; $(2)$ length of the redshift interval for which the confidence interval is calculated; $(3)$ single value reported by \citet{Murphy01b} 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}