A comparison of modeled and observed center-to-limb variation of linear polarization. Different kind of lines depict our calculations for different model atmospheres: FALC, FALP, FALA, HSRA labeled in plot a). Symbols in a), d), f), g), h) show the solar disk polarization measured by Leroy (1972), in c) by Wiehr & Bianda (2003), in b) by Wiehr (1975), and in e) by Mickey & Orrall (1974). The wavelength at which the measurement was taken is given in each plot individually.