\begin{table}%t5
\caption{\label{tab_other}The radial gradients of  N/H, Ne/H, S/H and Ar/H.}
%\centering
\par
\begin{tabular}{lll}
\hline\hline\noalign{\smallskip}
12 + log(X/H)               				&slope             		& central value      \\
 (1)						&(2)				&(3)			     \\					\hline
N/H      		          & --0.08 $\pm$ 0.03				& 7.53 $\pm$ 0.15			\\
Ne/H				    & --0.05 $\pm$ 0.04				& 7.71 $\pm$ 0.21				\\	
S/H				    & --0.06 $\pm$ 0.02				& 6.41 $\pm$ 0.11				\\	
Ar/H	  			  & --0.07 $\pm$ 0.03				& 6.98 $\pm$ 0.13				\\	
\hline
\end{tabular}
\end{table}