The Ceres OE compared to that of the asteroids in Belskaya & Shevchenko (2000); Belskaya et al. (2003); Shevchenko et al. (2016). Panel A: enhancement factor ζ(0.3°). Panel B: ratio of the intensities at 0.3° and 5.0°. The Ceres values are those for the clear filter in Table 4 (black star); the formal error of the enhancement factor is on the order of the plot symbol. The Cerealia Facula values are located somewhere on the horizontal line. To simplify the plot we included the F- and G types into the C type.