Chandra X-Ray Observatory
	(CXC)
Skip to the navigation links
Last modified: 3 December 2013

Regions


Regions are two-dimensional filters that can be used to include or exclude data from a given data file. They may be applied to any column in a file (time, spatial, etc.). Regions can be read and written by the ds9 imaging tool and read by CIAO tools (e.g. using a region with dmextract to extract just the source photons).

Regions are made up of a number of shapes that are listed in the dmregions ahelp page. The shapes can either be inclusive or exclusive and can be combined using either a boolean AND or boolean OR operation.

For more information on creating and using regions, see the following threads:



Last modified: 3 December 2013
Smithsonian Institute Smithsonian Institute

The Chandra X-Ray Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA.   Email:   cxcweb@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2014. All rights reserved.