\begin{table}%t2
  \caption{Mean variation in structural parameters and FP residuals.}
  \label{bootstrap}
\small%\begin{center}
{
\begin{tabular}{lcccccccccccc}
\hline\hline
& & & & & & & & & & & &  \\[-8pt]
&\multicolumn{2}{c}{$\it \Delta {\it FP}$}&\multicolumn{2}{c}{ $\Delta r_{\rm eff}$}& \multicolumn{2}{c}{$\Delta \Sigma_{\rm eff}$}& 
\multicolumn{2}{c}{$\Delta \sigma_0$}& \multicolumn{2}{c}{$\Delta n$}& \multicolumn{2}{c}{$\Delta M_{\rm b}$$^a$}\\
& & & & & & & & & & & & \\[-8pt]
\hline
&ODP & Fusion&ODP & Fusion&ODP & Fusion&ODP & Fusion&ODP & Fusion &ODP & Fusion\\
DSBs&--0.09 & 0.03& --0.26&--0.14&0.46&--1.02&\phantom{--}25.6&25.1&--0.57&0.17&\phantom{--}1.15&\phantom{--}1.25  \\
Errors &\phantom{--}0.03&0.01&\phantom{--}0.12&\phantom{--}0.10&0.53&\phantom{--}0.33&\phantom{--}6.97&6.10&\phantom{--}0.22&0.21&\phantom{--}0.42&\phantom{--}0.44\\
SSBs&--0.01&0.03&\phantom{--}0.05&\phantom{--}0.03&0.28&\phantom{--}0.02&--3.93&8.99&--0.12&0.01&--0.10&--0.11\\
Errors&\phantom{--}0.01&0.05&\phantom{--}0.03&\phantom{--}0.04&0.19&\phantom{--}0.83&\phantom{--}0.90&7.72&\phantom{--}0.10&0.47&\phantom{--}0.23&\phantom{--}0.56\\
\hline\\[-2mm]
\end{tabular}}
\parbox{15.5cm}{
$^a$ Statistical errors estimated by applying the bootstrap technique  are given within parenthesis.}
%\end{center}
\par
\end{table}