... Meta Index / Home Page The task reads the event pattern information of an input EPIC pn or EPIC MOS events file and determines the pattern distribution and pattern fraction of valid patterns of type single, double, triple, and quadruple. ... The models for single and double event fractions were derived to correct for corresponding event selections which were applied in accumulating an EPIC pn spectrum. The EPIC pn event fractions are included in the detector response matrices. ...