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Fig. 2

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Demonstrating the three possible situations that cause a known multiply-imaged QSO to have only one match in the QCC. The colours of the cycles represent the morphology types in DESI-LS catalogues. Green circles represent point-like sources, whereas white circles represent extended sources. For WG0214-2105, three out of its four images are recorded in the catalogue, but only one is labelled as point-like. For Β1608+656, the image with the green pentagon marker lacks a g-band detection. In the case of SDSSJ0924+0219, three of the lensed images have been identified as a single point-like source and the fourth image has been identified as an extended object.

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