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Fig. 2

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Continuum visibilities of Betelgeuse averaged over the continuum spectral channels between 2.28 and 2.293 μm. The insets show enlarged views of the second, third, and fourth/fifth lobes. The solid and dashed lines represent the visibilities for a uniform disk with a diameter of 42.05 mas and for a limb-darkened disk with a diameter of 42.49 mas and a limb-darkening parameter of 0.097 (power-law-type limb-darkened disk of Hestroffer 1997), respectively. The dotted lines represent the maximum range of the variations in the 2.22 μm visibility due to time-dependent inhomogeneous surface structures predicted by the three-dimensional convection simulation of Chiavassa et al. (2009), who presents the model prediction up to 70 arcsec-1.

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