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Histograms of the retrieved phases of the second SN image using the absorption lines Fe II, Hα, and Hβ and using only the third and fifth epoch of the first image. The phase inference is done for S/N = 10, 20, and 30 and for noiseless spectra. The thin red vertical lines in the histograms indicate the epochs of the two used spectra of the first image. The thick vertical line marks the input value of the second image. (a) Retrieved phase using the absorption line of Fe II. (b) Retrieved phase using the absorption line of Hα. (c) Retrieved phase using the absorption line of Hβ. (d) Retrieved phase combining all three absorption lines.
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