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Fig. A.1.

The synthetic Stokes V profiles for different magnetic strengths. Panel a: calculated Stokes V profiles of the Mg I 12.32 μm line for sunspot penumbrae with Bl = 400 G (red), Bl = 1000 G (magenta), Bl = 2000 G (blue), and Bl = 3000 G (green). Panel b: same as panel a, but for the Mg I 12.22 μm line.
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