\begin{table}%t1
\par
\caption{Groups of data considered  for methods that constrain $\frac{\Delta \alpha}{\alpha}$. }
\label{data}
%\centerline
 {\small 
\begin{tabular}{lcccc}
\hline
\hline
Method & Redshift or redshift interval& Number of data  & $\frac{\Delta \alpha}{\alpha} \pm \sigma$&Reference     \\
$(1)$ & $(2)$ & $(3)$& $(4)$ &$(5)$\\ \hline
Many Multiplet & $0.22 < z < 3.6$&   $128$  & $-0.543 \pm 0.116$&$(1)$  \\ 
Many Multiplet& $0.452 < z < 2.3$&    $23$ &$-0.06 \pm 0.06 $& $(2)$ \\ 
Many Multiplet & $ z=1.15$&   $1$  & $-0.05 \pm 0.24$ & $(3)$  \\  
RMM & $ z=1.15$&   $1$  & $-0.04 \pm 0.46$ & $(4)$ \\ 
Alkali Doublet  & $2 < z < 3$&   $19$  &$-0.50 \pm 1.30$ &$(5)$  \\ 
Alkali Doublet  & $1.9 < z < 2.8$&    $15$& $0.15 \pm 0.43$ & $(6)$  \\ 
SIDAM & $ z=1.15$&   $1$&$-0.007 \pm 0.084$  & $(7)$  \\ 
SIDAM & $ z=1.84$&   $1$  &$0.54 \pm 0.25$& $(8)$  \\
\hline 
\end{tabular}}
\medskip
 Notes. Columns: $(1)$ observational method;  $(2)$ redshift or redshift interval;  $(3)$  number of data;    $(4)$ mean value of $\frac{\Delta \alpha}{\alpha}$ and the corresponding $1 \sigma$ error in units of $10^{-5}$;   $(5)$ reference. References: (1) Murphy et~al. (2003); (2) \citet{Chand04}; (3) \citet{Chand06};  (4) \citet{QRL04}; (5)~\citet{Murphy01b}; (6) \citet{Chand05}; (7) \citet{Levshakov06}; (8) \citet{Levshakov07} 
\end{table}