Fig. 3.
Hardness ratio vs. median energy diagram for compact X-ray sources in the galaxies of our sample. Only sources with ≥20 net counts are plotted. Dashed lines show the median energy boundary of Ẽ0 = 1.2 keV (see Sect. 4.2). The distributions of sources over median energy are plotted below their corresponding median energy–hardness ratio diagram.
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