\begin{table}%t2
%\centering
\par
\caption{\label{lya_variations}Spatial variations of \lya\ properties in STIS slit positions.}
\small\begin{tabular}{l l c l c c  }
\hline
\hline\noalign{\smallskip}
\par
Slit   &      \nhi                             &    $\sigma_{N_{\rm H}}$         &   $EW_{\rm Obs}$        &  $\sigma_{EW}$                     &  $f$(1500 \AA)         \\
         &[cm$^{-2}$]                        &    ($\times 10^{21}$)       &   ~ [\AA]                  &                                                   &   [\ergscm]              \\
\hline \noalign{\smallskip} 
1     &     $1.8  \times 10^{21}$& 0.7 	              &  $-31$	    &  5		              & $2.8\times 10^{-16}$	\\ 
2     &     $2.4 \times 10^{21}$  & 0.5	              &  $-32$	   & 3		           & $9.6\times 10^{-16}$	 \\
3     &     $2.8\times 10^{21}$  &   0.5	             &  $-35$	 &  3		             & $3.0\times 10^{-15}$\\
4     &     $2.8\times 10^{21}$  &   0.8	             &  $-34$	 & 5		              & $4.1\times 10^{-15}$	        \\
5     &     $2.0\times 10^{21}$   &  0.7	             &  $-30$	 & 5		           & $2.9\times 10^{-15}$    \\ 
6     &     $1.0\times 10^{21}$    & 0.6	            &  $-20$	& 6		          & $1.3\times 10^{-15}$      \\
7     &     $2.5\times 10^{20}$&  0.1		            & $-10$ 	& 3		           & $5.8\times 10^{-16}$	    \\
\hline\noalign{\smallskip}
NW       &  $2.1\times 10^{21}$ &0.7                                 & $-31$              & 5                                              & $1.3\times 10^{-14}$    \\
MH03   &  $2.2\times 10^{21}$  &0.7                              & $-30$                    & 4                                              & $2.6\times 10^{-15}$  \\
\hline  
\end{tabular}
\end{table}