Brightness, gas velocities, and radial velocities in one temporal snapshot of the magnetic 3D simulation for 240 mT = 2400 G. Left: continuum intensity at solar disk center (μ = 1) near Fe I 683.7 nm. Center: vertical gas velocity (measured positive rising upward in the atmosphere) over a horizontal plane near Rosseland optical depth unity. The thin black lines depict the v_z = 0 contour separating the up- and downflows. Right: spectroscopic lineshifts for Fe I 683.7 nm (measured positive redshifted if receding downward into the atmosphere, thus inverting the color scale).