This task evaluates a number of statistics for a given region of interest. These are:
The corresponding statistical uncertainties are given as well.
The region is given in input as an saoimage compatible region file. If this file is not specified, the whole image is used.
The user can optionally specify a quality data set to be used to mask the region of interest.
Output positions are expressed in pixels and in WCS coordinates, if the appropriate information is present.