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Table 7

Systematic effects on the temperature measurement.

Source σT/T Comments

Background  <2% EPIC and ACIS, propagated
PSF  ≪2% EPIC and ACIS, not propagated
T gradient  < 0.1% EPIC and ACIS, not propagated

Σ  < 2%

Limited counts  <2% EPIC
Energy resolution 2% pn only
Gain 1−3% EPIC
Σ 4% propagated



Temperature measurements using the MEKAL model in the hard band;


temperature measurements using the Fe XXV/XXVI line ratio.

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