\begin{table}%t2
%\centering
\par
{
\caption{Abundances ([X/H] = ${\rm log (X/H)}_{\star} - {\rm log (X/H)}_{\odot}$) for the A and F dwarfs of the UMa moving group.\label{tab2}}
\begin{tabular}{c c c c c c c c c c c c c}
\hline\hline
HD & SpT & C I & O I & Na I & Mg I & Si I & Ca I & Sc II & Fe I & Ni I & Y II & Ba II \\
\hline
  4813 & F7IV--V &
  &$-$0.40&$-$0.19&$-$0.32&$-$0.15&$-$0.04&$-$0.28&$-$0.12&$-$0.12&&0.30 \\
 6763 & F0III--IV & &0.03&0.39&0.08&$-$0.11&0.09&0.13&$+$0.03&$+$0.02&&0.51\\
 11257 & F2V  
 &$-$0.40&$-$0.42&$-$0.36&$-$0.31&$-$0.42&$-$0.31&$-$0.31&$-$0.15&$-$0.17&$-$0.28&$-$0.14 \\
 88355 & F7V  &+0.18 &$-$0.55&$-$0.10&&$-$0.03&$-$0.02&&$+$0.08&$+$0.09&$-$0.10&0.06 \\
 91480 & F1V/F1V  &0.00 &$-$0.16&$-$0.21&0.13&$-$0.10&$-$0.14&0.02&$-$0.09&$-$0.16&$-$0.05&0.12\\
 111456 & F5V & &0.00&$-$0.27&&$-$0.09&$-$0.10&&$-$0.10&$-$0.11&&$+$ 0.07\\
 113139 & F5V &  &0.00&$-$0.27&&$-$0.10&$-$0.10&&$-$0.10&$-$0.11&&$+$ 0.07\\
 139798 & F2V  & &0.00&$-$0.20&&$-$0.38&$-$0.51&&$-$0.11&$-$0.12&&$-$0.66 \\
 151044 & F8V  &&$-$0.35&0.00&&0.00&0.07&&0.10&0.13&&0.26 \\  
  184960 & F7V  &&$-$0.35&$-$0.12&&$-$0.05&0.01&&$-$0.10&$-$0.09&&0.15   \\
\hline
$\langle[{\rm X/H}]\rangle$&&$-$0.07&$-$0.27&$-$0.09&$-$0.10&$-$0.15&$-$0.10&$-$0.11&$-$0.06&$-$0.06&$-$0.14&0.07\\
$\sigma$&&$\pm$0.16&$\pm$0.20&$\pm$0.22&$\pm$0.24&$\pm$0.16&$\pm$0.22&$\pm$0.22&$\pm$0.10&$\pm$0.23&$\pm$0.12&
$\pm$0.35\\
\hline
  1404 & A2V/A2V & &$-$0.10& &$-$0.11&0.27&$-$0.22&$-$0.01&$-$0.16&&&0.03\\
  6116 & A5m & &$-$0.57&0.34&&$-$0.07&$-$0.62&$-$0.47&$+$0.13&0.46&&0.43\\
  7804 & A3V &&$-$0.29&&$-$0.11&0.31&$-$0.01&0.05&$-$0.07&&&0.05 \\
  12471 & A2V & &$-$0.23&&0.24&0.78&0.09&0.17&0.29&&&0.69 \\
 56537 & A3V/A4IV  & &0.00&0.15&0.00&&0.04&0.11&$-$0.22&$-$0.09&&$-$0.08\\
 95418 & A1V &$-$0.20&$+$0.35&&$-$0.11&&$-$0.10&$-$0.24&$+$0.21&$+$0.60&$+$0.72&$+$1.12\\
 116657 & A1m & &$-$0.47&0.24&&$+$0.07&$-$0.53&$-$0.56&$+$0.20&0.36&&0.54\\
 193592 & A2V  & &$-$0.12&0.08&&$-$0.26&$-$0.48&&$-$0.40&$-$0.27&&$-$0.49\\
  206538 & A2V  & &$-$0.03&&$-$0.12&0.11&0.12&$-$0.07&$-$0.04&&&\\
  209515 & A0IV & &$-$0.77&&&&0.32&&0.10&&&$-$0.68 \\
   216627 & A3V/A3IV-V & &$-$0.39&&$-$0.39&$-$0.29&$-$0.01&0.05&$-$0.17&&&0.07 \\
  222603 & A7V/A6IV & $-$0.10 &$-$0.25&0.01&$-$0.33&$-$0.12&$-$0.15&$-$0.11&$-$0.19&$-$0.10&0.07&$-$0.12\\
\hline
$\langle [{\rm X/H}]\rangle $&&$-$0.15&$-$0.24&0.16&$-$0.12&0.09&$-$0.13&$-$0.11&$-$0.03&$-$0.16&0.40&0.14\\
$\sigma$&&$\pm$0.07&$\pm$0.25&$\pm$0.26&$\pm$0.26&$\pm$0.24&$\pm$0.26&$\pm$0.25&$\pm$0.21&$\pm$0.23&$\pm$0.28&
$\pm$0.40\\
\hline
\end{tabular}
}
\end{table}