Fig. 9
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Spectra and image of J150155.61-025728.4, the image separation is 19.32″. Left: DESI DR1 spectra of images A and B (smoothed for clarity; shaded bands show noise); vertical markers at z = 1.646. Right: DESI Legacy Surveys DR9 image. Data suggest that a galaxy group or cluster at z ≈ 0.89 may reside between the two quasar images; these plausible member galaxies are marked as white circles. See Appendix A.2.2 for details.
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