Left panel: value of the maximum of granulation and polarization cross-correlation. Blue curve: polarization in the FeI 630.15 nm line, red curve: polarization in the FeI 630.25 nm line, pink curve: positive peak in the cross-correlation of granulation with continuum polarization. Right panel: value of the minimum of the cross-correlation; the curves have the same meaning as in the left-hand panel. The horizontal axis gives the value of − sinθ for images in the southern hemisphere and of sinθ for images in the northern hemisphere, where θ is the heliocentric angle.