\begin{table}%t1
  %\centering
\par
  \caption {\label{tab:CoRoTpar}Parameters of the background models used. The photon noise level~$d$ is given in ppm$/\sqrt{\mu{\rm Hz}}$, while the background amplitudes~$a_i$ are given in ppm$^2/\mu$Hz, and the time-scales~$b_i$ in $10^6$~s. Three components were used for the Sun-like cases but~2 only for the red giant case.}
  \begin{tabular}{lcccccccccccc}
    \hline\hline
    Case & $V$ & $A$ & $d$ & $a_1$ & $b_1$ & $c_1$ & $a_2$ & $b_2$ & $c_2$ & $a_3$ & $b_3$ & $c_3$ \\
    \hline
    Active Sun & 6 & 10 & 0.65 & $2.0\times 10^4$ & $2.0\times 10^6$& 4.35 & 5.51 & 8205 & 3.5 & 0.19 & 341 & 1.4 \\
    $10 \times$ active Sun & 8 & 10 & 1.95 & $2.0\times 10^5$ & $2.0\times 10^6$& 4.35 & 55.1 & 8205 & 3.5 & 1.9 & 341 & 1.4 \\
    Red giant & 12 & 1000 & 6.8 & $3.5\times 10^5$ & $1.2\times 10^5$  & 4.0 & 55.1 & 6367 & 3 & -- & -- & -- \\
    \hline
  \end{tabular}
  \end{table}