Geometry of the EPIC-pn detector. Shown are the numbers of the CCDs, the field of view exposed to the sky (FoV), the raw coordinates (RAWX and RAWY), the detector coordinates (DETX and DETY) and the approximate location of the “Cu hole”. The position angle (PA) is the angle between the detector and sky coordinates, an example of which is shown. The four quadrants are shaded in different colours.