Fig. 3.
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Left panels: 45″ × 45″ cutout of the DESI Legacy Imaging Surveys Data Release 10 (Legacy Surveys/D. Lang (Perimeter Institute)) with the X-ray 1σ position circles in red (eROSITA) and green (XMM-Newton), for eRO-QPE3 (top) and eRO-QPE4 (bottom). Right panels: SALT optical spectra of eRO-QPE3 (top) and eRO-QPE4 (bottom), with inferred spec-z of ∼0.024 and ∼0.044, respectively. The sky spectrum of the red spectral exposure is shown in cyan in arbitrary units in both subpanels.
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