\begin{table}%t4
\caption{\label{tab4}PSF parameter values.}
%\centerline
{
\begin{tabular}{lcccccccc}
\hline\hline
\noalign{\smallskip}
Object Name  & $A_0$& $A_1$    & $A_2$ & $A_3$    & $A_4$   & $A_5$& $A_6$   &$A_7$ \\
             &      & $\times 10^{-2}$&       & $\times 10^{-5}$&$\times 10^{-5}$&      &$\times 10^{-4}$&      \\
~~~~~~~(1)    & (2)  &  (3)     &(4)    &    (5)   & (6)     &  (7) & (8)     & (9)  \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
PKS 0548--322 & 0.17 & 5.5  &  5.2  &  0.5 & 0.7  & 0.34 & 1.4 & 12.5  \\
3C 371        & 0.17 & 3.0  &  9.0  &  1.0 & 1.1  & 0.36 & 1.0 & 16.6  \\
PKS 2005--489 & 0.29 & 6.5  & 10.0  &  3.7 & 4.8  & 0.09 & 2.0 & 12.0  \\
BL Lac        & 0.30 & 2.0  &  7.1  & 14.0 & 0.2  & 0.02 & 1.8 & 70.0  \\
1ES 2321+419  & 0.12 & 2.8  &  6.5  & 14.0 & 0.5  & 0.30 & 1.7 & 85.0  \\
1ES 2344+514  & 0.32 & 3.0  &  9.0  &  4.5 & 1.0  & 1.64 & 0.8 & 15.0  \\
\hline
\end{tabular}}
\smallskip
{Columns}: $\rm (1)=Source$ name; $\rm (2){-}(9)=Values$ of the parameters of the analytical function used to fit the composed PSF (see Sect.~4 and~Eq.~(1)).
\end{table}