\begin{table}%t1
%\centering
\par
\caption{\label{obslog}List of Chandra observations of PSR J1740-5340 in NGC 6397}
\begin{tabular}{lccccccc}\hline \hline\\[-2ex]
      Obs. date  &   Obs. ID &   Instrument &   Data mode &   Effective exp. time &    Orbital phase  &    Net count rate\tablefootmark{a} & Off-axis(') \\\hline\\[-2ex]
     2000-07-31  &     79    &    ACIS-I    &       Faint &         48.3 ks       &   $0.146{-}0.553$   &    $1.89 \pm 0.25$\tablefootmark{b}  &  0.8745 \\[+0.5ex]                      
     2002-05-13  &   2668    &    ACIS-S    &       Faint &         28.1 ks       &   $0.035{-}0.267$   &    $1.74 \pm 0.25$    &  0.9368 \\[+0.5ex]
     2002-05-15  &   2669    &    ACIS-S    &       Faint &         26.7 ks       &   $0.501{-}0.719$   &    $2.89 \pm 0.33$    &  0.9214 \\[+0.5ex]
     2007-06-22  &   7461    &    ACIS-S    &  Very Faint &         90.0 ks       &   $0.189{-}0.950$   &    $2.26 \pm 0.16$    &  0.3732 \\[+0.5ex]
     2007-07-16  &   7460    &    ACIS-S    &  Very Faint &        149.6 ks       &   $0.437{-}1.714$\tablefootmark{c} &    $2.92 \pm 0.14$    &  0.2129 \\[+0.5ex]\hline\\[-2ex]
\end{tabular}
\tablefoot{\tablefoottext{a}{ACIS-S net count rates in units of $10^{-3}$ counts/s  corrected to the on-axis.}
\tablefoottext{b}{The ACIS-I on-axis net count rate is $1.31\pm0.17$. In order to derive a comparable ACIS-S net count rate from the observed  ACIS-I rate we convert the ACIS-I rate by using the WebPIMMS tool (\protect\url{http://heasarc.gsfc.nasa.gov/Tools/w3pimms.html}).}
\tablefoottext{c}{The total exposure time covers more than one binary orbit.}}
\end{table}