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Fig. 4
Mid-IR (ν25F25) vs. X-ray (F(0.5–2 keV)) fluxes of the sources populating the lower-left region in Fig. 2 after excluding the sources classified as “Seyfert”, “LINERs” or “Star” by NED. The straight line (blue line in the electronic version only) indicates the mean value of the ν25F25/F(0.5–2 keV) of these sources.
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