\begin{table}%t3
%\centering
\par
\caption{\label{tab3}Relative line intensities and observational parameters for SNRs spectroscopically observed in M~74.}                   
\small          
\begin{tabular}{c c c c}     
\hline\hline         
Line & SNR2 & SNR3 & SNR5 \\
\hline
H$\beta$($\lambda$4861)& 100 & 100 & 100\\
OIII($\lambda$4959)&  3 &  60 &  50\\
OIII($\lambda$5007)& 27 & 122 &  160\\
NII($\lambda$5200) & -- &  3 & --\\
He($\lambda$5876) &  13 & 33 & 9 \\
OI($\lambda$6300) &  17 &  21&  32\\
OI($\lambda$6364) &  14 &--&  7\\
NII($\lambda$6548) & 30 & 154&  56\\
H$\alpha$($\lambda$6563)& 288  & 589 & 335\\
NII($\lambda$6583)& 48 & 281 &  85\\
SII($\lambda$6716) &  92 & 297& 122\\
SII($\lambda$6731) & 41  & 239 &  73\\
\hline 
$E_{(B-V)}$& 0.07 & 0.06     & 0.06\\
I(H$\alpha$ )& 6.0E-15 erg cm$^{-2}$ s$^{-1}$&  2.9E-15 erg cm$^{-2}$ s$^{-1}$   &  2.8E-15 erg cm$^{-2}$ s$^{-1}$ \\
$[$SII$]$/H$\alpha$ & 0.46 & 0.91 &  0.58\\
\hline            
\end{tabular}
\end{table}