\begin{table}%t3
\caption{\label{tab3}Abundances of oxygen and nitrogen adopted from calculations by \cite{Gorny2009}
and compared to earlier published results.}
\small%\centering
\par
\begin{tabular}{            l
               c c @{\hspace{1.40cm}} l} 
\hline
\hline\noalign{\smallskip}
            & \multicolumn{2}{c}{This work~~~~~~~~~~} & ~~~~~~~~~~~~~~Literature \\
            & log O/H+12  & log N/O &  (log O/H + 12; log N/O) \\
\hline\noalign{\smallskip}
  H 1-16    &  8.83       & $-$1.06   &  (9.09; --1.32)$^{\rm Sa}$ \\
  Hb 6      &  8.66       & $-$0.18   &  (8.71; --0.06)$^{\rm AK}$ \\
  M 2-10\tablefootmark{a}
            &  8.67       & $-$0.28   &  (8.78; --)$^{\rm G}$~~ (8.86; --0.49)$^{\rm R}$~~ (9.00; --0.55)$^K$~~ (8.90; --0.59)$^{\rm St}$ \\
  H 1-50    &  8.66       & $-$0.37   &  (8.65; --0.51)$^{\rm E}$ \\
\noalign{\smallskip}
  H 1-20    &  8.61       & $-$0.10   &  (8.97; --0.56)$^{\rm E}$~~ (8.45; --)$^{\rm G}$~~ (8.97; --0.23)$^{\rm R}$~~ (9.30; --0.67)$^{\rm Sa}$~~ (8.73; --0.44)$^{\rm K}$ \\
  Th 3-4    &  8.22       & $-$0.11   &  \\
  M 3-38    &  8.39       &  0.19   &  (8.37; 0.32)$^{\rm R}$~~ (8.79; --0.61)$^{\rm Sa}$~~ (8.54; --0.22)$^{\rm K}$~~ (8.37; --)$^{\rm St}$ \\
  M 3-8     &  8.38       & $-$0.26   &  (8.59; --0.42)$^{\rm E}$~~ (9.02; --0.27)$^{\rm R}$~~ (8.12; --0.27)$^{\rm C}$~~ (8.15; --0.33)$^{\rm St}$ \\
\noalign{\smallskip}
  H 1-40    &  8.19       & $-$0.25   &  (9.09; --0.04)$^{\rm E}$~~ (8.23; --0.45)$^{\rm HS}$~~ (8.70; --0.62)$^{\rm R}$~~ (8.62; 0.02)$^{\rm St}$ \\
  M 2-23    &  8.35       & $-$0.99   &  (8.48; --1.44)$^{\rm E}$~~ (8.67; --1.00)$^{\rm HS}$~~ (8.21; --0.13)$^{\rm St}$~~ (8.22; --0.82)$^{\rm R}$~~ (8.48; 0.20)$^{\rm K}$ \\
  He 2-260  &  8.00       & $-$0.76   &  \\
  H 1-32    &  8.59       & $-$1.21   &  (8.55; --0.23)$^{\rm St}$~~ (8.12; --0.53)$^{\rm R}$ \\
  H 1-35    &  8.65       & $-$1.19   &  (8.31; --0.92)$^{\rm R}$~~ (8.27; --0.89)$^{\rm K}$ \\
\hline 
\end{tabular} 
\tablefoot{Results by \cite{Cuisinier2000}, \cite{Escudero2004}, \cite{Gorny2004} and \cite{WangLiu2007} are not
presented as the line measurements from these papers were used by \cite{Gorny2009}.\\ \tablefoottext{a}{The values adopted are the averages of original calculations
  (see Table~4) by \cite{Gorny2009} and from \cite{Stasinska1998}.}}\vspace{-2mm}
\tablebib{AK -- \cite{AllerKeyes1987}, 
            C -- \cite{Costa1996},
            E -- \cite{Exter2004}, 
            G -- \cite{Gutenkunst2008}, 
            R -- \cite{Ratag1997},\\
            K -- \cite{Koeppen1991},
            Sa -- \cite{Samland1992},  
            St -- \cite{Stasinska1998},
            HS -- \cite{HoofSteene1999}.}
\par
\end{table}