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: http://xmm.vilspa.esa.es/sas/8.0.0/doc/espfilt/node5.html
Дата изменения: Wed Jul 2 04:11:26 2008 Дата индексирования: Fri Sep 5 18:32:27 2008 Кодировка: |
The main routine accepts a space-separated list of event files of any combination of MOS and PN exposures.
This task assumes that SAS tasks cifbuild, odfingest and one of the event-list producing EPIC MOS or PN task (emchain, emproc, epchain, epproc) have previously been run.
An error will result if the odfingest ASCII output file or the cifbuild FITS file are not present and set using the proper SAS environment variables or command line options.
For the Corner Method, espfilt performs the following in sequence:
Clean the light curve by creating a histogram of rate values from the light curve, finding the most likely value, assuming that to be similar to the mean of the quiescent rate, then fitting a Gaussian (or poissonian, or user defined curve) to a small window around that value in the histogram to determine the true mean and dispersion of the quiescent background rate. Excludes time intervals with rate higher than a multiple of the dispersion above the mean quiescent background and excludes good regions shorter than some (currently hardcoded) limit.
For the Ratio Method: