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Fig. 7.
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Infrared colours of the steep- and flat-spectrum sources. Symbols are the same as in Fig. 1. Upper: WISE colour–colour diagram of W1 − W2 against W2 − W3. The AGN wedge proposed by Mateos et al. (2012) is drawn as a grey solid line. Lower: cumulative density function of W3 − W4 of flat-spectrum and steep-spectrum sources.
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