Fig. 3.
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Densities of some source properties for each class of the 4XMM-DR11 training sample. SC_HR2: second hardness ratio of 4XMM-DR11 (between bands 0.5–1 and 1–2 keV), from EPIC-pn and MOS cameras. log(FX/FW1): logarithm of the X-ray to infrared (W1-band, 3.4 μm) flux ratio. LX: mean 0.2–12 keV observed luminosity. Separation/Gal. radius: galactocentric distance, i.e., the source separation to the host centre, in units of the host radius at the source position angle.
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