\begin{table}%T2
\caption{Average of log $n$(Li) for NGC~3960 in three different ranges of effective temperatures.}
\label{average_Li}
%\centering
 \small
\begin{tabular}{c c c c} 
\hline\hline 	
$\Delta T_{\rm eff}$ & $\langle$log $n$(Li)$\rangle$   & error & error type\\
\hline
[6050--6350]~K 	      & 2.72	      & 0.25	& $\sigma$\\
\par
[5750--6050]~K 	      & 2.19	      & 0.48	& $\sigma$\\
\par
[5500--5700]~K 	      & 1.88	      & 0.35	& maximum error\\
\hline                                   %inserts single line
\end{tabular}
\end{table}