Fig. 9
Inblue: histograms of the number of peaks in the profiles of linear polarization found from 1000 synthetic cases of stars with (from left to right) ℓmax = 1, 3, 5, and 6. In red: common to the four plots, the histograms of the number of peaks in the real dataset of Betelgeuse. The comparison of both histograms is satisfactory for ℓmax = 3–5.
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