Fig. 5.
Observed differential visibility amplitude |dV| versus wavelength λ, normalised to 1 in the continuum (blue), and its decrease across the Hα profile. Uncertainties of |dV| are also plotted (grey). Synthetic visibilities (yellow) are shown for the two “extreme” values of the shell’s outer radius Routsh = 40 R⊙ (top) and 120 R⊙ (bottom).
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