...
2009 XRT CCD calibration paper, Godet et al. 2009 AA 494 775
http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2009A%2526A...494..775GFUL
2013 XRT CCD trap mapping paper, Pagani et al. 2011 AA 534 20
http://adsabs.harvard.edu/abs/2011A%26A...534A..20P