\begin{table}%t2[ht]
\caption{Fit parameters obtained for Model A: $f$ and $b$ are the PCTR
and the background intensity, relative to the quiet sun average intensity;
$x$ and $y$ are the HI and HeI column densities in units of $10^{17}$~cm$^{-2}$.\label{tab2}}
%\centering
\par
\begin{tabular}{ccccccc}
\hline\hline  \noalign{\smallskip}
Filament & $f$  & $b$  &  $x$  &  $y$  & HeI/HI & $\chi^2$ \\
\hline 
%       &        &      &        &      &          &      \\
FP1    &  0.    & 0.97 &  4.2   & 0.2  & 4.8 ($-$2) & 0.41 \\
       &  0.1   & 0.78 &  5.1   &0.2   & 3.9 ($-$2) & 0.65 \\
       &  0.2   & 0.60  & 6.5   & 0.3   &4.0 ($-$2) & 1.23  \\
F2     &  0.    & 1.14  & 5.6   & 0.5   &8.4 ($-$2) & 0.74 \\
       &0.1     & 0.99  & 7.0   & 0.6   &8.6 ($-$2) & 1.13 \\
       &0.2     & 0.94  & 9.5   & 0.9    &9.5 ($-$2) & 2.1 \\
F3     &0.      & 0.61  & 4.7   & 0.4    & 7.9 ($-$2)& 0.22 \\
       &0.1     & 0.49  & 7.2   &0.6     & 9. ($-$2) & 0.51 \\
       &0.2     & 1.35  & 19    &2.5     &1.3 ($-$1) & 3.8 \\
\hline
\end{tabular}
\end{table}