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Fig. 10.

image

Left panel: distribution of the W1 − W2 colour for the classified KiDS DR4, colour coded according to their classification family (red for QSO, black for GALAXY, blue for STAR). Right panel: distribution of the W1 − W2 colour for the train samples. A fair agreement can be found between corresponding classes, although the distribution for the full catalogues is generally broader than that of the training samples. In both panels, the peak of the QSO distribution is shifted towards larger W1 − W2 with respect to the GALAXY and STARS, as expected.

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