Chandra X-Ray Observatory
Last modified: 7 September 2018


The areascale value records the area scaling factor for a PHA spectrum file. If the area scaling is independent of channel, it is written to the AREASCAL header keyword; otherwise, it is recorded in an AREASCAL column.

As of CIAO 4.4, Sherpa incorporates the AREASCAL keyword from Type I and II PHA files.

Last modified: 7 September 2018
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