3-D visualization image (right) of raypaths (white lines) to three common reflection point (CRP) gathers on one subsalt reflector. Note the center CRP is illuminated by shots and receivers far to the west (left) of its location. The top of salt is color-coded surface (mostly reds and yellows) and subsalt reflector is colored in shades of green. A 3-D pre-stack depth migrated seismic line is plotted to the right. 3-D visualization can be an invaluable tool in understanding imaging problems.