\begin{table}%t2
\caption{\label{flux-tbl}Reported sensitivity to the Crab giant pulse observations
  in the literature.}
\small%\centering
\par
  \begin{tabular}{lcc}
    \hline\hline
    \noalign{\smallskip}
    Reference &  Frequency   &   Threshold  \\
    &  (MHz) &  (Jy) \\ 
    \hline
     \citet{lcu+95}   & 800  & 120.0    \\
    \citet{ps07}     & 1197      & 5.9\tablefootmark{a}\\
    \citet{btk08}   & 1300/1470  & 22.3\tablefootmark{b} \\
    This paper   & 1373 & 3.9   \\ 
    \hline
  \end{tabular}
\tablefoot{\tablefoottext{a}{Equivalent average pulse computed flux from
  the quoted 6$\sigma$~peak flux density of 142~Jy, assuming 0.036~pulse duty cycle.}\\
  \tablefoottext{b}{Average pulse flux density extrapolated for
  $7\sigma$ threshold, 4.1~$\mu$s time resolution and pulse duty
  cycle $\approx$0.036.}}
\end{table}