\begin{table}%t2
\caption{Coefficients of the calibration equations.}
%\centering
\par
\begin{tabular}{ccc} 
\hline  \hline
$ A_0$ & $ A_1 $ & $A_2 $\\
$ 4.637 \pm   0.009$ &  $0.14$  &  $-0.012 \pm   0.010$\\
\hline
$ B_0$ & $ B_1 $ & $B_2 $\\
$ 5.574 \pm   0.002$ &  $0.25$  &  $ 0.095 \pm   0.005 $\\
\hline
$ C_0$ & $ C_1 $ & $C_2 $\\
$ 5.100 \pm   0.002$ &  $0.05$  &  $-0.008 \pm   0.002$\\
\hline
$ D_0$ & $ D_1 $ & $D_2 $\\
$ 4.352 \pm   0.007$ &  $0.10$  &  $-0.029 \pm   0.012$\\
\hline
$ E_0$ & $ E_1 $ & $E_2 $\\
$ 6.989 \pm   0.002$ &  $0.55$  &  $-0.048 \pm   0.008$\\
\hline
\end{tabular}
\label{calib}
\end{table}