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Fig. 15

image

Optical-infrared colour-colour diagram for sources in the AllWISE anomaly sample with intermediate 0 ≤ W1−W2 < 0.8 and also present in the SDSS photometric dataset. Blue and red dots are respectively stars and galaxies according to SDSS morphological classification. All magnitudes are here AB; WISE W1 was converted following Jarrett et al. (2011).

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