Variations of the temperature (yellow line) and v_LOS (orange line) of the perpendicular cross-cuts shown in Fig. 3. They are plotted based on their values extracted along the oscillation trajectory in POS marked in Fig. 4 at the depth log(τ_500 nm) = −4.31 (i.e. where the Ca II K line is most sensitive to atmospheric perturbations). The oscillation of v_POS is plotted in grey for comparison.