Spatial distribution of the 412 detected wave packets during the FISS observing period, 20:11:55–21:59:03 UT. The top panels show the Hα intensity and chromospheric LOS velocity maps. The middle and bottom panels display the band-filtered velocity maps. The numeric values in the brackets of each map are the lower and upper bounds for byte-scale display. The arrows depict detected wave packets, with their centers located at the midpoint between two chosen points used for cross-correlation analysis. The direction of the arrows shows the wave propagation direction. The length of the arrows corresponds to the propagation speed, proportional to c^1/3. The colors of the arrows distinguish the wave packets from one another based on different period bands: light green for 3-minute waves, medium green for 5-minute waves, and dark green for 10-minute waves. The white, blue, and red contours in the intensity map represent the 1000 Gauss, 150 Gauss, and −150 Gauss, respectively.