\begin{table}%t2
   %\centering
\par
      \caption{\label{XMMcounts}Photons of 51~Peg in {\it XMM} and {\it Chandra}; see text for details.}
        \begin{tabular}{l l l l l  l l l l}
    \hline\hline
    Energy & \multicolumn{2}{l}{PN} & \multicolumn{2}{l}{MOS1+2} & \multicolumn{2}{l}{ACIS-S} & \multicolumn{2}{l}{HRC}\\
    (keV)& s & b & s & b & s & b & s & b\\ \hline \\[-3mm]
    0.15--0.2   & ... & ... & ... & ... & $\rm 1^{+2.4}_{-0.4}$ & 0 & ... &...\\[-3mm]\\
    0.2--0.45   & $\rm 17^{+5.0}_{-3.0}$ & 9.1  & $\rm 7^{+3.6}_{-1.6}$ & 4.9 & $\rm 6^{+3.6}_{-1.6}$ & 0 &...&... \\[-3mm]\\  
    0.45--0.65 & $\rm 8^{+3.9}_{-1.9}$ & 3.5 & $\rm 6^{+3.5}_{-1.5}$ & 3.2 & $\rm 0^{+2}_{-0}$ & 0 & ... & ...\\[-3mm]\\  
    0.65--2.0   & $\rm 10^{+4.3}_{-1.5}$ & 10.4 & $\rm 21^{+7.2}_{-0.8}$ & 23.2 & $\rm 0^{+2}_{-0}$ & 0 & ...&...\\[-3mm]\\ 
    0.15--2.0   & ... & ...& ... & .... & ...& ...& $\rm 21^{+5.7}_{-3.7}$ & 0.6 \\[-3mm]\\
    \hline
    \end{tabular}
   \end{table}