Comparison of the center-to-limb variation of the convective blueshift of Fe I 6173.3 Å between LARS and HMI. Doppler velocities of LARS represent the average of the lower 80% of the bisector profile (in contrast to the lower 5% in Fig. 9). Each data point represents the temporal average of an observation sequence, with error bars indicating the mean error. Colors and symbols indicate the radial axis of the solar disk. The mean curve and its standard deviation are displayed as black solid line and gray area. The HMI curve (purple solid line) and its polynomial fit (purple dashed line, Eq. (2)) range from the solar disk center (μ = 1.0) toward the limb (μ = 0.1).