Example of craters on Ceres not recognized as binary. Clear stratigraphic relationships can be established in the case of craters presented in panels a, b, d, and f; typically the rim in contact between the craters is not a septum but is characterized by a circular shape. In the case of panel c, the imaging data present artifacts that preclude any conclusion regarding the synchronicity of the impacts. Panel e shows two craters with a septum but their degradation state and depth/diameter ratio are significantly different, indicating a nonsynchronous impact.