\begin{table}%t2
\caption{\label{tabres2}Filament contrasts for which the correlation is equal to zero.}
\small%%\centerline

 {
\begin{tabular}{ccc}
\hline \hline
 Contrast & Fit &  Literature \\ 
 \hline
 $C_{\rm Ca}$ &  0.20  &  0.70  \\ 
 $C_{\rm H\alpha}$  & 0.13  & 0.35  \\
 $C_{\rm fil}$ &   0.30 &     0.20  \\ 
 \hline
 $C_{\rm fil}$(corr = 0)  & 1.16  &  3.08   \\
 $C_{\rm fil}$(corr = 0)/$C_{\rm fil}$   &  3.9 & 15.4  \\  
 \hline
\end{tabular}}
\medskip
Note 2. Given the fitted contrasts for the three types of structures or those found in the literature, a filament contrast for which the correlation is equal to zero is given, in absolute value and relative to the solar value (see Sect.~4 for details). 
\end{table}