Detailed view on the variability of mass flux for model A. Panel a: space-time diagram of the local mass flux through the inner boundary. Panel b: time evolution of the mass accretion rate onto the binary. Panel c: power spectral density of the total mass accretion rate onto the binary (black line) and of the mass flux at each colatitude (colored lines). Green lines correspond to the range 0 ≤ θ ≤ π/3, blue lines to the range 2π/3 ≤ θ ≤ π, and orange lines to the range π/3 ≤ θ ≤ 2π/3.