\begin{table}%T3
\caption{Accepted good exposure time and fraction of total exposure time remaining after filtering out 
intervals of high background in the full energy band (0.5--7.3~keV). Calculated for each EPIC instrument 
in each {\it XMM-Newton} observation used in XEST. The penultimate column lists the approximate lowest 
detectable count-rate for a 4$\sigma$ detection in the PN; for a 30~ks exposure in purely quiescent background, 
this would be 1.1~c~ks$^{-1}$. For XEST-26 only the MOS cameras were used and the MOS1 value has been multiplied 
by a factor 2.7 to calculate a PN-equivalent source count-rate. The final column lists the total number of 
detections made in the summed EPIC images.}
\label{tab3}
%\centering
\par
\begin{tabular}{crrrrrrcr}
\hline\hline
Field & \multicolumn{2}{c}{M1} & \multicolumn{2}{c}{M2} & \multicolumn{3}{c}{PN} & EPIC\\
      & $t_{\rm good}$ & Per cent & $t_{\rm good}$ & Per cent & $t_{\rm good}$ & Per cent & $C_{\rm 4\sigma}$ & $N_{\rm det}$\\
      & s & & s & & s & & c~ks$^{-1}$ \\
\hline
01 & 50~215 & 62.9 & 50~944 & 63.9 & 41~756 & 57.2 & 1.06 & 104\\
02 & 39~078 & 95.4 & 39~638 & 96.8 & 27~895 & 71.0 & 1.63 &  76\\
03 & 22~814 & 65.2 & 23~908 & 68.3 & 15~647 & 47.1 & 1.81 &  37\\
04 & 29~722 & 89.9 & 29~710 & 89.9 & 29~131 & 95.0 & 1.19 &  70\\
05 & 24~125 & 76.3 & 24~229 & 76.6 & 15~963 & 53.9 & 1.86 &  36\\
06 & 30~777 & 97.4 & 30~894 & 97.7 & 27~858 & 92.9 & 1.30 & 103\\
07 & 30~013 & 95.1 & 30~183 & 95.6 & 25~338 & 84.2 & 1.29 &  52\\
08 & 35~577 & 85.6 & 35~841 & 86.2 & 26~699 & 71.7 & 1.66 &  82\\
09 & 25~009 & 79.0 & 25~170 & 79.5 & 19~272 & 64.3 & 1.82 &  81\\
10 & 28~597 & 90.3 & 28~649 & 90.5 & 25~476 & 84.8 & 1.31 &  66\\
11 & 34~245 & 82.5 & 35~075 & 84.2 & 30~972 & 80.7 & 1.14 & 104\\
12 & 30~398 & 97.9 & 30~451 & 98.1 & 28~673 & 97.4 & 1.17 &  90\\
13 & 24~561 & 77.8 & 24~979 & 79.1 & 20~918 & 70.5 & 3.11 &  37\\
14 & 28~832 & 84.6 & 28~942 & 84.9 & 24~173 & 74.9 & 1.65 &  78\\
15 & 23~372 & 75.5 & 23~475 & 75.9 & 19~166 & 63.1 & 1.67 &  84\\
16 & 23~864 & 58.9 & 25~683 & 63.3 & 13~705 & 40.2 & 2.54 &  46\\
17 & 26~750 & 86.7 & 26~804 & 86.9 & 22~898 & 78.3 & 1.59 &  68\\
18 & 28~540 & 90.1 & 28~654 & 90.5 & 26~500 & 89.8 & 1.24 &  66\\
19 & 30~235 & 80.0 & 30~544 & 80.8 & 26~086 & 75.4 & 1.29 &  90\\
20 & 31~494 &100.0 & 31~479 &100.0 & 29~877 &100.0 & 1.18 &  76\\
21 & 29~060 & 74.9 & 29~094 & 75.4 & 18~386 & 40.4 & 2.03 &  75\\
22 & 55~031 & 96.8 & 54~931 & 96.6 & 50~484 & 92.7 & 0.76 & 116\\
23 & 57~519 & 79.9 & 57~496 & 79.8 & 41~190 & 59.5 & 1.11 &  76\\
24 & 32~069 & 72.6 & 31~991 & 72.4 & 24~253 & 60.2 & 1.57 &  63\\
25 & 16~411 & 97.8 & 16~466 & 98.1 & 14~399 & 94.9 & 1.84 &  54\\
26 &124~995 & 97.4 &125~270 & 97.6 &   --   &  --   & 0.81 & 165\\
27 & 37~770 & 87.3 & 27~864 & 87.5 & 35~416 & 85.2 & 1.16 & 153\\
28 &124~833 & 95.4 &124~951 & 95.5 &120~693 & 93.1 & 0.52 & 199\\
\hline
\end{tabular}
\end{table}