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Fig. 6.


Integrated optical depth of the observed Cas A spectra cross-correlated with the expected template spectrum. The outlying peak at the redshift (z = −0.000158) of the −47 km s−1 component is clearly visible. The histogram on the right shows the binned distribution of integrated optical depth. Cas A α-transition stacking demonstrates our method in a regime with a high signal-to-noise ratio.

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