Illustration of the boresight strategy. Left panel: PN image of PSZ2 G057.78+52.32, at z = 0.0654, right panel: PN image PSZ2 G066.41+27.03, at z = 0.575. The yellow grid shows the layout of the PN camera with the nominal boresight marked with a small box. Depending on the roll angle, the observation boresight is moved 2′ along pn CCD 4. This avoids the cluster centre region being affected by gaps between CCD chips.
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