Fig. 8.
Three steps of our method applied to ϵ-transition stacking in the spectrum of Cas A: (A) the integrated optical depth at each redshift (see Sect. 3.1) where mirrors are seen at, e.g., zm = ±0.004, (B) the spectral cross-correlation (see Sect. 3.2), and (C) the stack cross-correlation (see Sect. 3.3). This example demonstrates the behavior of the method in the presence of broad RRLs.
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