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Fig. 10

image

Average cross-correlation map showing the evidence for surface differential rotation. Darker regions represent better correlation. The average longitudinal cross-correlation functions in 5° bins are fitted by Gaussian curves. Gaussian peaks are indicated by dots and the corresponding Gaussian widths by horizontal lines. The continuous line is the best fit, suggesting antisolar differential rotation with Peq = 28.35 d equatorial period and α = − 0.11 surface shear.

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