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The fraction of the
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annulus
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defined by the inner
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/outer
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radius r_in
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/r_out, which is covered by the extraction region of each instrument. For cross-calibration purposes, the measured fluxes must be divided by the numbers in table in order to extrapolate the fluxes to the full annulus.
Cluster r_in r_out XMM-Newton/pn XMM-Newton/MOS Chandra/ACIS
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