Snapshots from the NSO time-series Doppler images of σ Gem. As examples, the 1st (top), the 17th (middle), and the last (bottom) combined (Fe+Ca) maps are shown. Arrows below the maps mark the phases of the observations. Time lags between the consecutive maps are 23.17 days (from 1st to 17th) and 20.44 days (from 17th to 34th).
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