\begin{table}
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\caption{Chandra  observations of the \object{M~31} core. An asterisk denotes observations that were made within 30 days of  an XMM-Newton observation; the relative times of these observations are given in the fourth column.\label{journc}}
\begin{tabular}{llllll}
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Obs. & Date  (obs. ID)& MJD & Mode&  Exposure & Separation \\
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c1 & 13/10/99  (303)&51464& ACIS-I& 12 ks&  \\
c2 & 30/11/99 (267) & 51512 &HRC-I& 1.3 ks\\
c3 & 11/12/99 (305)& 51523& ACIS-I & 4.2 ks \\
c4 & 23/12/99 (268) & 51535& HRC-I & 5.2 ks\\
c5 & 27/12/99  (306)& 51539& ACIS-I & 4.2 ks \\
c6 & 19/01/00 (269) & 51562 & HRC-I & 1.2 ks\\
c7 & 29/01/00 (307)& 51572& ACIS-I& 4.2 ks\\
c8 & 13/02/00 (270) & 51587& HRC-I& 1.5 ks\\
c9 & 16/02/00 (308) & 51590&ACIS-I& 4.1 ks\\
c10 & 08/03/00 (271) & 51611& HRC-I& 2.5 ks\\
c11$^*$ & 26/05/00 (272) & 51690& HRC-I & 1.2 ks & $-$30 days\\
c12$^*$ & 01/06/00 (309)&51696& ACIS-S & 5.2 ks & $-$24 days\\
c13$^*$ & 21/06/00 (273) & 51716& HRC-I & 1.2 ks & $-$4 days\\
c14$^*$  & 02/07/00 (310)&51727& ACIS-S  &5.1 ks & +7 days \\
c15 & 29/07/00 (311) & 51754& ACIS-I& 5.0 ks \\
c16 & 18/08/00 (275) & 51774 & HRC-I & 1.2 ks\\
c17 & 27/08/00 (312) & 51783& ACIS-I& 4.7 ks\\
c18 & 11/09/00 (276) & 51798 & HRC-I & 1.2 ks\\
c19 & 12/10/00 (277) & 51829 & HRC-I & 1.2 ks \\
c20 & 17/11/00 (278) & 51865 & HRC-I & 1.2 ks \\
c21$^*$ & 31/11/00 (1912) & 51879 & HRC-I & 47 ks & $-$27 days\\
c22$^*$ & 13/12/00 (1581) & 51891& ACIS-I& 4.5 ks& $-$15 days\\
c23$^*$ & 13/01/01 (1854) & 51922& ACIS-S& 4.8 ks& +16 days\\
c24 & 01/02/01 (1569) & 51941 & HRC-I & 1.2 ks\\
c25 & 18/02/01 (1582)& 51958& ACIS-I& 4.4 ks\\
c26$^*$ &10/06/01 (1570) & 52070 & HRC-I & 1.2 ks & $-$19 days\\ 
c27$^*$ & 10/06/01 (1583)& 52070& ACIS-I & 5.0 ks& $-$19 days\\
c28 & 31/08/01 (1577) & 52152& ACIS-I& 5.0 ks \\
c29 & 09/11/01 (1585) & 52222& ACIS-I& 5.0 ks \\
c30 & 19/11/01 (2904) & 52232& HRC-I& 1.2 ks \\
c31$^*$ &08/01/02 (2897) & 52282& ACIS-I& 5.0 ks & +1.5 days\\
c32$^*$ & 16/01/02 (2905) & 52290& HRC-I & 1.1 ks & +10 days\\
c33 & 02/06/02 (2906) & 52427 & HRC-I & 1.2 ks \\
c34 & 02/06/02 (2898) & 52427 & ACIS-I & 5.0 ks \\
c35 & 11/08/02 (4360) & 52497 & ACIS-I& 5.0 ks \\
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\end{tabular}
\end{table}