Fig. 4.
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Sgr A* ALMA light curves of the fractional polarization for the four spectral bands, the depolarization measure, the rotation measure, and the spectral index (from top to bottom) for all four days (from left to right, April 21, 22, 24, and 25). The gray-shaded band on April 24 marks the time range of the Chandra X-ray flare.
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