Normalized response functions of the Ca II K line to the perturbations of V_LOS (the left column), V_turb (the middle column), and T (the right column) for the marked pixel in Fig. 2a at three time steps, namely t = 33.0 s (quiescent phase, the first row), t = 41.3 s (intermediate CBG phase, the second row), and t = 49.6 s (when the CBG is at its maximum brightness, the third row). The inferred atmospheric quantities are shown with a solid red curve and the median profile over the entire FOV is shown in gray for comparison. The observed intensities are shown with red (CBGs) and gray (median profile) filled circles in the right column, and the fitted line profiles are shown with dashed curves. A gamma correction with γ = 0.5 was applied on the T response function before display.