Reduced magnitude vs. phase angle. The values correspond to the mid-point reduced magnitude in the R filter. The different symbols correspond to the different datasets. In addition to our results the mid-point reduced magnitude from Lowry et al. (2006) and Lamy et al. (2006) are shown. The solid line indicates the slope of β = 0.076 mag/°, while the dotted one represents the slope of β = 0.063 mag/°. The blue dashed-dotted line represents the IAU-adopted phase law with G = −0.45 from Lamy et al. (2007).