a Field dependence of the Hall resistivity ρxy at the indicated temperatures. b Field dependence of Hall conductivity σxy at the indicated temperatures. The solid lines are the fit to Eq. (4). c Temperature dependence of the carrier concentrations ne and nh,e. Inset: ratio of nh/ne as a function of temperature. d Temperature dependence of the mobilities μh,e. The error bars in c and d are errors obtained from the fitting of Eq. (4) to the experimental data.