\begin{table}%t1
\caption{\label{tab:observations}Overview of the observations. $I_{\rm c}$: continuum intensity.}
%\centerline
{\small
\begin{tabular}{lccc}
\hline\hline
Date             & Nov. 3, 2005 & Oct. 18, 2007& May 23, 2008 \\\hline
Target           & Pore        & Network     & Network \\
Position         & 10$^{\circ}$ & 20$^{\circ}$ & 30$^{\circ}$ \\        
VIP FOV          & $26\arcsec\times35\arcsec$ & $18\arcsec\times40\arcsec$ & $16\arcsec\times38\arcsec$\\
Wavelength       & 630.2~nm  & 630.25~nm   & 430.34~nm \\
Line(s)          & 2 \ion{Fe}{i}, O$_2$ &  \ion{Fe}{i}, O$_2$ & CH, \ion{Fe}{ii}   \\
Step Size        & 1.9~pm     & 1.9~pm      & 1.6~pm  \\
Points           & 42+46          & 35           & 68 \\
Exposure         & 300~ms     & 300~ms      & 300~ms \\
Cadence$^1$        & 72~s+79~s     &     70~s           & 120~s \\
Noise level      & 2$\times$10$^{-3}$~$I_{\rm c}$  & 2$\times$10$^{-3}$~$I_{\rm c}$   & 3$\times$10$^{-3}$~$I_{\rm c}$\\
TIP FOV          &  --         & 4.8\arcsec$\times$78\arcsec & 12.5\arcsec$\times$78\arcsec \\
Imaging         &   --          &  G-band & G-band \\
\hline
\end{tabular}}
\tablefoot{$^1$~Including disk write time; the scan time is about 10--20~s shorter, depending on the number of wavelength points.}
\end{table}