Fig. 9.

Center-to-limb variation of the convective blueshift of Fe I 6173.3 Å. The Doppler velocities represent the average value of the lower 5% of the bisector profile. Each entry represents the temporal average of an observation sequence, with error bars indicating the mean error. The measurements along the four radial axes can be distinguished by the colors and symbols. The average center-to-limb variation is displayed as black solid line, with its standard deviations as gray area.
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