Left panel: Stokes I FORS 2 spectra of three components of the multiple system ADS 10991 (HD 164492A, HD 164492C, and HD 164492D) in the vicinity of the Hγ line. Right panel: Stokes I (top) and V / I (bottom) FORS 2 spectra of HD 164492C in the vicinity of the Hβ line.
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