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SynopsisPerform background subtraction Syntaxsubtract( id ) DescriptionThe subtract command performs background subtraction according to the equation: Measured = Total - Background * Data Exposure * Data Area Counts Counts Counts Back Exposure Back Area BugsSee the bugs pages on the Sherpa Beta website for an up-to-date listing of known bugs. See Also
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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 © 1998-2004. All rights reserved. |