List of all XMM survey-type observations (≤ AO-10) in the XXL fields.
Notes. The full table is available at the CDS. FieldName is the internal XXL labelling; n(s) stands for the XXL-N (XXL-S) field; a,b,c... tags indicate that the same sky position has been observed several times in different AOs (consult the ESA XMM log using the ESA ObsId) because the quality of earlier pointings was insufficient; the z tag means that a fictitious pointing has been created combining the events of all usable repeated pointings in order to improve the quality. In total there are 542 and 81 a,b,c and z pointings, respectively. In the case of repeated fields, and of overlaps from adjacent fields, the X-ray catalogue will remove overlapping detections and will only consider the one from the better pointing, or, in the case of equal quality, the object with the smallest off-axis angle. Columns 5 to 7 give the remaining exposure (in ks) after selection of the good-time intervals, for the MOS and pn detectors. Quality Flag: 0 = Good quality/1 = Low exposure/2 = High background/3 = 1 and 2. The “good quality pointings” correspond to the green+blue histograms presented in Fig. 7. Badfield flag: 0 for best acceptable observation at a given position/1 for deep/good observation from the archives, not part of XXL proper/2 other acceptable XXL observation at same position/3 bad pointings, i.e. quality = 3. This flag is used in the overlap removal procedure. Column 10 is ticked if Xamin detected at least one object in this pointing. Column 11 is ticked if at least one source in this pointing survived the overlap removal procedure and hence entered the X-ray source catalogue.
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