Synthetic line profiles (Ti i at 2223 nm) of single vertical rays of the K0V-star simulation in an upflow region (upper panels) and in a downflow region (lower panels). Left panels: temperature (solid), pressure (dotted), and vertical component of the fluid velocity (dashed) along the vertical ray. Right panels: profiles of the Ti i line at 2223 nm obtained with SPINOR for the corresponding vertical rays (Δλ = λ − λ_rest; the dashed lines give the bisectors of the profiles).