\begin{table}%t2
\caption{\label{tab2}Model parameters for the C200 detector.}
%\centering
\par
\begin{tabular}{l|cccc}
\hline\hline
parameters     & \multicolumn{4}{c}{C200 detector pixels}\\
\hline
              & 1     & 2     & 3     & 4\\
\hline
$\beta_{10}$  &  0.94 &  0.98 &  0.86 &  1.01\\
$\beta_{11}$  & $-$0.12 & $-$0.16 & $-$0.10 & $-$0.14\\
$\beta_{12}$  &  0.23 &  0.20 &  0.22 &  0.27\\
$\tau_{10}$   &  5.92 &  4.53 &  3.77 &  4.92\\
$\tau_{11}$   &  4.65 &  6.68 &  5.34 &  5.46\\
$\tau_{12}$   & $-$0.60 & $-$0.49 & $-$0.52 & $-$0.57\\
$\beta_{20}$  & $-$0.2980 & $-$0.0879 & $-$0.1430 & $-$0.0269\\
$\beta_{21}$  & 0.440 & 0.245 & 0.342 & 0.200\\
$\beta_{22}$  & 0.0088 & $-$0.1900 & $-$0.0750 & $-$0.0241\\
$\tau_{20}$   & $-$4.90 & $-$4.87 & $-$4.88 & $-$4.95\\
$\tau_{21}$   & 5.14 & 5.20 & 5.20 & 5.14\\
$\tau_{22}$   & $-$0.00313 & $-$0.00439 & $-$0.00167 & $-$0.00249\\
\hline
\end{tabular}
\end{table}