Center-to-limb variation of the convective shift. The Doppler velocities (in m s⁻¹ ) from the line core of Fe I 6301.5 Å (upper panel) and Fe I 6302.5 Å (lower panel) are plotted against the heliocentric parameter from the disk center (μ = 1.0) toward the solar limb (μ = 0.3). The data points represent the average for each sequence. The colored symbols indicate the solar axis. The error bars show the standard deviation of the respective sequence. The black solid line displays the average curve v_CLV (μ). The gray dashed line and shaded area depict the synthesis of de la Cruz Rodríguez et al. (2011) and its assumed error.