Afρ versus the days from perihelion date measured at the nucleocentric distance of 10 000 km in R-band data. Black dots represent the original A(α)fρ values without phase-effect correction. Red triangles (a), rhombuses (b), and squares (c) are the reduced A(0)fρ values considering a pure silicate, pure organic, and mixed composition, respectively. The error bars are derived from the 10% uncertainty in the Afρ measurements. The two arrows in (a) mark the Afρ measurements during the two post-perihelion outburst events.