... The eboxdetect task has two different modes of operation: (1) local detection and (2) map detection. eboxdetect is first run in local mode. The local mode source lists serves as input for task esplinemap which creates background maps (one per energy band for each EPIC instrument) which are then used to run eboxdetect in map mode. ... In both modes, source searching is only performed in the area of the images which is marked by an optional detection mask created by task emask . ...