Periodograms computed from the dα astrometric residuals of G 196−3B (only OMEGA2000 data). The highest peaks are found at 228.46 d (left panel, solid line, Lomb-Scargle algorithm, Scargle 1982) and 233.88 d (right panel, Plavchan algorithm, Plavchan et al. 2008). The “cleaned” periodogram produced by the algorithm of Roberts et al. (1987) and normalized to the Lomb-Scargle peak power is plotted as a dotted line in the left panel.
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