Fig. 3

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Initial 1D gas density (in g cm−3) structure as a function of modified radius x0 = 1 − R0/r, with R0 as the lower boundary radius. The cyan curve is corresponding FASTWIND density structure as described in Sect. 2.3. The red-dashed vertical line is the optical photosphere R★. The shaded-purple region is the instability region where we provide the initial perturbations (see zoomed-in part).
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