Fig. 7
Left: comparison of the fluxes corrected for ISM absorption of O-type stars in IC 1805 in the 0.5−10 keV energy band as determined with XMM-Newton and Chandra. The filled symbol stands for HD 15558, which is subject to mild pile-up in the Chandra data. The dashed line corresponds to the one-to-one relation. Right: comparison of the 0.5−2.5 keV ROSAT fluxes of O-type stars versus the 0.5−10 keV XMM-Newton fluxes.
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