... This task converts an EPIC PN raw events file (produced by epframes and badpix ) into a calibrated event list with flagged trailing events and corrected for gain variations of the preamplifier channels and charge transfer inefficiency (CTI). It performs a pattern analysis to identify and recombine split events and converts the raw unlinearized detector coordinates into corresponding physical locations. ... Analysis of extended sources or in the vicinity of moderately bright sources . ...