Angle-domain CIG gathers have attractive properties when a complex velocity model causes multipathing of reflected energy. They are free of the imaging artifacts caused by reflector-position ambiguity that degrade the image obtained from either shot gathers or common-offset gathers. We presented a simple method for extracting angle-domain CIGs from the prestack wavefield downward-continued using the wave equation. Our method produces high-quality CIG gathers that can be readily used for either velocity analysis or AVA analysis. Experimentation with the Marmousi dataset shows that our methods are valid.