\begin{table}%t4
\caption{\label{uncert}Uncertainties in the derived abundances due to uncertainties in the stellar parameters.}
\par
%\centering
\small  
  \begin{tabular}{l  c c c c c}
  \hline\hline
  \noalign{\smallskip}
      &   $\Delta { \log\varepsilon(\rm  C) }$   &  $\Delta { \log\varepsilon(\rm  N) }$ &  $\Delta { \log\varepsilon(\rm  O) }$&  $\Delta { \log\varepsilon(\rm  S) }$    \\
    \hline
   $\Delta T_{{\rm eff}}=+75$~K   &  +0.04  & $+$0.06 &  +0.12 &  $-$0.05 \\
   $\Delta \log g = +0.3$~(cgs)  &  +0.10 & $-$0.03 &  +0.00 & +0.10 \\
  $ \Delta \xi_{\rm micro} = +0.25~{\rm km~s}^{-1}$  &  $-$0.01  & $-$0.02 & $-$0.02 & $-$0.00 \\
  $ \Delta {\rm [Fe/H]} = +0.05$ dex &  $+$0.02  & $+$0.04 & $+$0.04 & $+$0.00 \\
  $ \Delta {\rm [\alpha/H]} = +0.1$ dex  &  +0.03 & +0.02 &   +0.04 &  +0.02\\
  \hline
\end{tabular}
\end{table}