\begin{table}%t1
  %\centering
\par
  \caption{\label{table1}Overview of data taken on May 18, 2004.}
    \begin{tabular}{ccccccc}
            \hline\hline
            Instrument & Passband & $\lambda$ & $\Delta\lambda$(\AA) & Spatial resolution (\arcsec) & Time cadence & Pixel size (\arcsec)\\
            \hline
            MDI/SOHO & \ion{Ni}{I} & 6768~\AA & 0.094& 4 & 1~min & 1.96 \\
            TRACE & \ion{C}{IV}+cont & 1600~\AA & 275 & 1 & 30~min & 0.5\\
            BBSO & \ca\ & 3933~\AA & 0.6 & 2-4 & 30~s & 0.645 \\
            BIMA & continuum & 3.5 mm & & 12 & 10~s & 3.0 \\
            \hline
    \end{tabular} 
\end{table}