Distance of the spacecraft to Earth (smooth blue curve; left vertical axis) and normalised daily dust impacts (jagged red curve; right vertical axis) with a centred moving average of 45 d. The time intervals when the high data transfer rate was in use and the times spent at the Lagrange points are indicated by shaded areas. The distance to Earth is given in Earth radii, 1 R_e ≈ 6378 km.