Fig. A.1.

Comparison of redshift between the two central observations of Perseus, 0085110101 and 0305780101, for different detector regions. (Top panel) Comparison of Cu-Kα redshifts after correction, with an estimated systematic of 75 km s−1. (Bottom panel) Comparison of astrophysical redshifts, with two sets of error bars showing the statistical uncertainty on the redshift after correcting for the Cu-Kα best-fitting redshift, and the error bars extended by the uncertainty on the Cu-Kα redshift. Shown is the systematic of 150 km s−1.
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