Magnetograms at τ = 1 (left), smoothed vertical velocity at τ = 1 (middle), and vertical flow velocity in 12 Mm depth (right) for three different times during the active region decay phase. In the velocity plots black contours indicate vertical magnetic field with more than 1.5 kG in the photosphere. The shape of the decaying spots and distribution of strong flux concentrations in the plage region is determined to a large degree by the convection patterns near the bottom of the domain. Positive velocity values (blue colors) indicate upflows.