\begin{table}%t2
  \caption{\label{tab: obs-filter}Filters used in this study.} 
%\centering
\par
\begin{tabular}{cccc}
  \hline\hline
  Filter & Instrument & $\lambda_{\rm c}$ & $\Delta \lambda$ \\
  & & $\mu$m & $\mu$m \\
  \hline
  $B$   & EFOSC2 & 0.440 & 0.094 \\
 $V$   & EFOSC2 & 0.548 & 0.113 \\
  $R$   & EFOSC2 & 0.643 & 0.165 \\
  $i$   & EFOSC2 & 0.793 & 0.126 \\
  $J$   & Hawk-I & 1.258 & 0.154 \\
  $H_S$ (CH4) & Hawk-I & 1.575 & 0.112 \\
  \hline
\end{tabular}
\tablefoot{
$\lambda_{\rm c}$ = Central Wavelength, $\Delta
    \lambda$ = Bandwidth.}\vspace*{-3mm}
\end{table}