\begin{table}%t4
\caption{\label{tab_tot_abu}The chemical abundances of our MMT~sample.}
%\centering
\par
\begin{tabular}{lllllll}
\hline\hline\noalign{\smallskip}
\#    				& He/H        & O/H 		& N/H 	& Ne/H 	& Ar/H 	& S/H                \\
(1)					&(2)			&(3)	     &(4)		&(5)		&(6)		&(7)\\
\hline
1         & 0.076 $\pm$ 0.001	    &8.10 $\pm$ 0.07          & 6.72 $\pm$ 0.15     	&   --  					& 5.96 $\pm$ 0.34     	& 6.27 $\pm$ 0.20\\
2         & 0.081 $\pm$ 0.001       & 8.35 $\pm$ 0.05		& 7.17 $\pm$ 0.11     	&  7.58 $\pm$ 0.015& 6.20 $\pm$ 0.09    & 6.92 $\pm$ 0.21 \\
3         & 0.058 $\pm$ 0.003       &7.97 $\pm$ 0.08		& 6.88 $\pm$ 0.12		&--		      			& 6.02 $\pm$ 0.11    & 6.62 $\pm$ 0.15\\
4         & 0.088 $\pm$ 0.010       &8.36 $\pm$ 0.05		& 7.24 $\pm$ 0.19		&--		      			& 5.82 $\pm$ 0.18    & 6.46 $\pm$ 0.19\\
5         & 0.085 $\pm$ 0.005       &8.45 $\pm$ 0.02          & 7.35 $\pm$ 0.14     	&--					   	&--				& 6.59 $\pm$ 0.12\\
6         &0.114 $\pm$ 0.003        &8.52 $\pm$ 0.08			& 6.86 $\pm$ 0.15     	&7.60 $\pm$ 0.20     	& 6.27 $\pm$ 0.12   & 6.50 $\pm$ 0.20\\
7         & 0.085 $\pm$ 0.005       &8.30 $\pm$ 0.12          & 7.09 $\pm$ 0.20     	&7.00 $\pm$ 0.18     	& 6.07 $\pm$ 0.16   & 6.61 $\pm$ 0.15\\
8         & 0.113 $\pm$ 0.005       &8.21 $\pm$ 0.07			& 7.30 $\pm$ 0.24      	&7.69 $\pm$ 0.42    	& 6.20 $\pm$ 0.20   & 6.49 $\pm$ 0.15\\
9         &0.092 $\pm$ 0.008        &8.33 $\pm$ 0.10		& 7.21 $\pm$ 0.10		& 7.53 $\pm$ 0.20  		&6.22 $\pm$ 0.30	&   6.79 $\pm$ 0.10\\
10		 & 0.077 $\pm$ 0.005       &8.11 $\pm$ 0.08			& 6.88 $\pm$ 0.29      	& --  					& 6.16 $\pm$ 0.22	&   6.66 $\pm$ 0.15\\
11        & 0.093 $\pm$ 0.003       &8.30 $\pm$ 0.07		& 7.37 $\pm$ 0.02	 	& --							&  6.30 $\pm$ 0.30	&   7.09 $\pm$ 0.11\\
12		 & 0.091 $\pm$ 0.008	     &8.15 $\pm$ 0.07		&7.94 $\pm$ 0.05		&7.20 $\pm$ 0.10			&6.24 $\pm$ 0.10			&6.51 $\pm$ 0.20\\
13	       &0.080 $\pm$ 0.005           & 8.32 $\pm$ 0.05		&  6.92 $\pm$ 0.12		&--						&6.19 $\pm$ 0.12       &6.36 $\pm$ 0.18   \\
14        &0.076 $\pm$ 0.003            &7.87 $\pm$ 0.08   		& 6.93 $\pm$ 0.15		&   7.11 $\pm$ 0.20		& 5.89 $\pm$ 0.20		& 6.41 $\pm$ 0.18\\   
15		 &0.089 $\pm$ 0.006		    &7.92 $\pm$ 0.08  		& 6.75 $\pm$ 0.15		&   --   						& 5.92 $\pm$ 0.18		& 6.57 $\pm$ 0.15\\   
16		 &0.086 $\pm$ 	0.005		    &8.27 $\pm$ 0.07		& 7.20 $\pm$ 0.14		&   --						&  --   					& 6.52 $\pm$ 0.20\\   
17        &0.115 $\pm$ 0.008		    &8.01 $\pm$ 0.08		& 6.62 $\pm$ 0.16		&  7.16 $\pm$ 0.18		& 5.93 $\pm$ 0.14		& 6.40 $\pm$ 0.18\\   
18        &0.078 $\pm$ 0.005		    &8.35 $\pm$ 0.05		& 7.35 $\pm$ 0.12		&   --   						& 6.35 $\pm$ 0.15		& 6.94 $\pm$ 0.20\\  
19		 &0.059 $\pm$ 0.003		    &8.40 $\pm$ 0.05         & 8.05 $\pm$ 0.10		&   8.03 $\pm$ 	0.18		& 5.16 $\pm$ 0.18		&  7.02 $\pm$ 0.17\\   
20   	 &0.083 $\pm$ 0.001	    & 8.08 $\pm$ 0.05		& 6.91 $\pm$ 0.15	 	&   6.87 $\pm$ 0.18	&  6.18 $\pm$ 0.25	&   6.64 $\pm$ 0.15\\
21    	 &0.086 $\pm$ 0.001	    &8.42 $\pm$ 0.06		& 7.56 $\pm$ 0.13	 	&   7.31 $\pm$ 0.15	&  6.01 $\pm$ 0.27	&   6.63 $\pm$ 0.10\\
22        & 0.072 $\pm$ 0.005       & 8.35 $\pm$ 0.12		& 7.34 $\pm$ 0.16	 	&   7.75 $\pm$ 0.38 &  5.67 $\pm$ 0.50   &   6.89 $\pm$ 0.11\\
23       &0.088 $\pm$ 0.001        & 8.17 $\pm$ 0.12		& 6.97 $\pm$ 0.18	 	&   --					&   6.15 $\pm$ 0.14  &  6.73 $\pm$ 0.23 \\
24        &0.080 $\pm$ 0.008        & 8.28 $\pm$ 0.15		& 7.10 $\pm$ 0.20	 	&   7.61 $\pm$ 0.28	&   6.14 $\pm$ 0.32  & 6.71 $\pm$ 0.40\\
25        &0.096 $\pm$ 0.005	    &8.38 $\pm$ 0.13		& 7.37 $\pm$ 0.15	 	&   7.36 $\pm$ 0.20	&   5.84 $\pm$ 0.10	& 6.57 $\pm$ 0.15\\
26 		 &0.061 $\pm$ 0.003	    &  7.98 $\pm$ 0.05		&6.98 $\pm$ 0.15		&   7.28 $\pm$ 0.12	&   5.86 $\pm$ 0.15	& 6.36 $\pm$ 0.13\\
27        &0.095 $\pm$ 0.001	    &  8.48 $\pm$ 0.08		&  7.62 $\pm$ 0.12	 	&   7.73 $\pm$ 0.15 &  6.33 $\pm$ 0.25	&   6.87 $\pm$ 0.15\\
28        &0.088 $\pm$ 0.002        & 8.30 $\pm$ 0.07		&7.10 $\pm$ 0.18		&  7.42 $\pm$ 0.20	&6.23 $\pm$ 0.30	&   6.63 $\pm$ 0.20\\
29        & 0.091 $\pm$ 0.005		& 8.31 $\pm$ 0.10		&  7.19 $\pm$ 0.15     	&   7.46 $\pm$ 0.25	 &   6.42 $\pm$ 0.24  &   6.92 $\pm$ 0.21\\
30        &0.096 $\pm$ 0.003		& 8.42 $\pm$ 0.06		&  7.20 $\pm$ 0.12	& 7.85 $\pm$ 0.21	 	&   6.37 $\pm$ 0.32  & 6.75 $\pm$ 0.23\\
31			&  0.097 $\pm$ 0.005		&8.47 $\pm$ 0.08			&  7.26 $\pm$ 0.15	&   7.76 $\pm$ 0.20	&   6.29 $\pm$ 0.25		& 7.06 $\pm$ 0.15\\   
32			& 0.079 $\pm$ 0.005		&8.27 $\pm$ 0.08			&  7.21 $\pm$ 0.17	&   7.58 $\pm$ 	0.21	&   5.49 $\pm$ 	0.30		&  6.83 $\pm$ 0.15\\   
33			&0.067 $\pm$ 0.008		&7.93 $\pm$ 0.10			&  7.10 $\pm$ 0.20	&   --		 			&  6.09 $\pm$ 0.21		&   6.51 $\pm$ 0.20\\   
\hline\noalign{\smallskip}
&0.085$\pm$0.011	&8.27$_{-0.17}^{+0.12}$ & 7.31$_{-0.35}^{+0.30}$&	7.56$_{-0.30}^{+0.18}$	&6.13$_{-0.22}^{+0.14}$ & 	6.71$_{-0.34}^{+0.19}$ \\[2pt]					\hline
\end{tabular}
\end{table}