\begin{table}%t3
\caption{Full width at half minimum differences $\Delta$~{\it FWHM} of
synthetic profiles computed with constant 900~G and zero field strength ({\em synt}),
profiles observed in the pore and a~granule~($pore - gr$) and in the pore, and an~intergranular lane~($pore - ig$).}
\label{tab3}
%\centering
\small
 \begin{tabular}{l@{~~}ccccc}
\hline\hline
%& & & & & \\[-8pt]
\multicolumn{2}{c}{line} & $g_{\rm eff}\lambda^2$ [10$^7$\AA$^2$] & \multicolumn{3}{c}{$\Delta$~{\it FWHM} [m\AA]}           \\
                  &       &                                                     & $synt$ & $pore - gr$ & $pore - ig$ \\
\hline
\ion{Fe}{i}  & 4992.8  & 3.2 &  4 &  4 & 4  \\
\ion{Fe}{ii} & 4993.3  & 1.5 &  3 & $-1$ & 15 \\
\ion{Fe}{i}  & 4994.1  & 3.7 &  5 & 30 & 28 \\
\ion{Ca}{i}  & 6455.6  & 4.2 &  9 & 22 & 30 \\
\ion{Fe}{ii} & 6456.4  & 5.0 & 11 & 29 & 35 \\
 \hline
 \end{tabular}
\end{table}