\begin{table}%t4
\caption{Confidence intervals for different redshifts.  }\label{table7}
%\centerline
 {\small \begin{tabular}{cccccc}
\hline\hline
 $z$  & $\Delta z$& Reported interval  & Reference & Confidence interval & Reference  \\ 
 $(1)$ & $(2)$ &$(3)$ &$(4)$ & $(5)$ & $(6)$ \\
  \hline
 $z=1.15$ & $0.24$& $(-0.091,0.077)$& $(1)$ &$(-1.4,-0.06)$ & $(7)$ \\ 
 $z=1.15$ & $1.5$&  $(-0.091,0.077)$& $(1)$&$(-0.13,0.13)$ & $(8)$ \\  
 $z=1.15$ & $0.24$& $(-0.5,0.42)$& $(2)$&$(-1.4,-0.06)$  & $(7)$  \\ 
 $z=1.15$ & $1.4$&  $(-0.5,0.42)$& $(2)$&$(-0.13,0.13)$ &$(8)$   \\  
  $z=1.15$ & $0.24$& $(-0.19,0.29)$&$(3)$ &$(-1.4,-0.06)$ & $(7)$  \\ 
 $z=1.15$ & $1.5$&  $(-0.19,0.29)$&$(3)$ &$(-0.13,0.13)$ &$(8)$   \\ 
 $z=1.84$ & $0.55$&$(0.29,0.79)$ & $(4)$&$(-1.21,0.56)$ & $(7)$  \\ 
 $z=1.84$ & $1.8$& $(0.29,0.79)$ & $(4)$&$(-0.13,0.15)$ & $(8)$  \\ 
 $z=0.69$ & $0.32$& $(-0.19,0.35)$& $(5)$&$(-0.87,0.53)$ & $(7)$  \\  
$z=0.765$ & $0.26$& $(0,0.54)$& $(6)$&$(-0.79,0.51)$  & $(7)$   \\  
 $z=0.685$ & $0.33$& $(-0.02,0.24)$&  $(6)$&$(-0.99,0.49)$ & $(7)$\\
  \hline
\end{tabular} }
\medskip 
 Notes. Columns: $(1)$ redshift; $(2)$ redshift interval for which the confidence interval is calculated;    $(3)$ single value reported by one author in units of $10^{-5}$;  $(4)$ reference of Col.~$(3)$; $(5)$ calculated confidence interval from a group of data of another author in units of $10^{-5}$;  $(6)$ reference of Col.~$(5)$. References: (1) \citet{Levshakov06}; (2) \citet{QRL04}; (3) \citet{Chand06}; (4) \citet{Levshakov07}; (5) \citet{Murphy02}; (6) \citet{kanekar05}; (7) \citet{Murphy03b}; (8) \citet{Chand04}.
\end{table}