Fig. 9.
Distribution of the sample in the ALLWISE two-colour selection plane (Mateos et al. 2012). 
and 
. X-ray flux (Fx) is in units of 10−11 erg cm−2 s−1 in the energy range of 0.2–12 keV. The two figures are representative of the distribution of the sample in the ALLWISE plane, and the variation with W2 and W3 magnitudes shows a similar pattern.
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