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Fig. 8.

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Surface differential of Altair from the 2D model of Bouchaud et al. (2020) expressed by a frequency in c/d as a function of co-latitude (solid blue line). The dotted lines show the 2-sigma uncertainty of the model parameter, while the horizontal red line shows the frequency 2.99 c/d, which shows up in the 2012 data in Fig. 9.

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