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Fig. 3

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Stellar case: linear polarization degree of the star radiation as a function of the magnetic field strength expressed in the reduced form where ω is the Larmor pulsation and τ is the upper level lifetime. pmax is the polarization degree that would be observed at a star limb point in a zero magnetic field. This figure replaces Fig. 1 of López Ariste et al. (2011).

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