... ewavelet (ewavelet-3.9) [xmmsas_20070708_1801-7.1.0] . ... The task ewavelet detects sources in an image using the mexican hat wavelet algorithm. The algorithm detects both point sources and extended sources provided that the source extent is not too large ( 1/8th the image size). ... Countrate estimation . ... Background estimation . Avoiding spurious detections near edges in the image . Creating reconstruction image and background image from an input source list . ... Algorithm . ...