Background Files

• Interim solution for background files in SAS:

• Provide event lists from collection of high latitude pointings - sources and flares removed, cosmetic defects “filled in”

• Extract background in same DETX,DETY co-ordinates as source region

• Caveats:

- No collection available with all filters, which combined with N_H variation reduces utility for soft band

- Different selection expressions - earlier version of processing

- Need appropriate normalisation

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