Spectropolarimetric synthesis of the Ca II 8542 Å line at several time steps. Top panel: temporal evolution of the vertical velocity (solid line, left axis) and temperature perturbation (dashed line, right axis) at constant geometrical height z = 750 km. Remaining panels: Stokes I (left panels) and Stokes V (right panels) synthesized at a fixed time step. The time is indicated at the top left side of the Stokes I figures and by the vertical dotted line in the top panel.