\begin{table}%t10
\caption{\label{table:10}Coefficients of the 
         best-fit polynomials for the observed relations between 
         the additional emission-line flux ratios and the oxygen abundance,
         where $\log~R = b_0 + b_1 y + b_2 y^2 + b_3 y^3$
         [$y \equiv 12+\log($O/H)].}
\small%\centering
\par
\begin{tabular}{l c c c c }
\hline\hline
Flux ratio (log $R$) & 
$b_0$ &
$b_1$ &
$b_2$ &
$b_3$ \\
\hline 
log [$F$([Ne{\sc iii}]$\lambda$3869)/$F$([O{\sc ii}]$\lambda$3727)] &
  --8.2202E+1 &  +3.2014E+1 & --4.0706E+0 &  +1.6784E--1 \\
log [$F$(H$\alpha$+[N{\sc ii}]$\lambda\lambda$6548,6584)/$F$([S{\sc ii}]$\lambda$6720)] &
  --1.4789E+2 &  +5.9974E+1 & --7.8963E+0 &  +3.4069E--1 \\
log [$F$([O{\sc iii}]$\lambda$5007)/$F$(H$\beta$)] &
  --5.7906E+1 &  +1.5437E+1 & --1.0872E+0 &  +9.1853E--3 \\
log [$F$([O{\sc ii}]$\lambda$3727)/$F$(H$\beta$)] &
   +1.5253E+2 & --6.1922E+1 &  +8.2370E+0 & --3.5951E--1 \\
\hline
\end{tabular}
\end{table}