Temperature (left column) and v_LOS (right column) variations of the three cuts marked in Fig. 3 over time. The panels show the temperature and v_LOS variations along the POS oscillation trajectory (marked in Fig. 4) for a depth range where Ca II K is sensitive to the perturbations in the atmosphere. Solid curves are the smoothed plots of the actual values that are shown with dots. Red curves mark the depth where Ca II K has the highest sensitivity to atmospheric perturbations. These curves are plotted individually in Fig. 6.