Center-to-limb variation of the polarized profiles of the Sr I 4607.3 Å line, spatially averaged over one image per μ-value. To avoid cluttering, only three out of the ten measured μ positions are displayed. For comparison, the Stokes I profile given in the FTS atlas (black solid line) and Stokes I_Gan02 taken from Gandorfer (2002; green dashed line) is included. Each Stokes I spectrum is normalized to the continuum point at −90 mÅ. Residual polarimetric offsets after flat-fielding are removed by subtracting the value of Q/I, U/I and V/I at −90 mÅ from the respective profiles at each wavelength position.