Chromospheric response to photospheric blueshifts. The four rows correspond to SP scans 1, 2, 4, and 5, respectively. The blue contour represents the BSF at the time when the SP slit was above the feature while the green contour represents the same at other instances of time. See text for description of yellow arrows. The white and black contours correspond to the umbral and penumbral areas, respectively, determined from the G-band intensity.