Fig. 2.
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Filtergram of Stokes Q (left column), U (middle column), and V (right column) at a wavelength Δλ = −0.2 nm from the line center of the Mg I 12.32 μm line. From top to bottom: Synthetic Stokes profiles and those with a random Gaussian noise of amplitudes 5 × 10−4, 1 × 10−3, 5 × 10−3, and 1 × 10−2 relative to the mean continuum intensity Ic, respectively.
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