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Fig. 4

image

Average latitudinal cross-correlation map from time-series Doppler images. For the combined (Fe+Ca) reconstructions 17 image pairs are averaged. Best correlating latitudinal shifts are marked with dots (Gaussian peaks); the corresponding error bars are proportional to the Gaussian FWHMs. The joint positive shift suggests poleward spot migration at an average velocity of 4° per rotation period.

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