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Fig. 2.
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Top-left: Colour image of the field from SDSS DR16 (Field 2.5 × 2.5 arcmin; north is up east is left). Bottom-left: Contour plot of the field. Right: Optical spectrum of the QSO (top) and that of the companion galaxy (bottom). The main spectral features in the QSO and the companion galaxy are marked.
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