Fig. 4.
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Definition of the two sub-samples of companion galaxies (see text). Red and black point represent galaxies that are associated and not associated with the QSO, respectively. The two rectangles define the sub-samples (see also text). Sub-sample A (magenta rectangle): 0.1 < z < 0.35 and PD < 300 kpc. Sub-sample B (blue rectangle): 0.25 < z < 0.35 and PD < 600 kpc.
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