Center-to-limb variations of the displacement (in arcsec) of the cross-correlation peak of polarization and reversed granulation images. Left panel: for the FeI 630.15 nm total polarization. Right panel: for the FeI 630.25 nm total polarization. The displacements have been divided by sin(θ) to correct the perspective effect from the projection on the plane of the sky. Results obtained in the northern (southern) hemisphere are shown as a function of sinθ (− sinθ). The thick blue lines show least-squares fittings of the measurements by constant values on each hemisphere.