For information about the Rhea mosaic used as the base for this map, see Th. Roatsch, E. Kersten, M. Wählisch, A. Hoffmeister, K.-D. Matz, F. Scholten, R. Wagner, T. Denk, G. Neukum and C.C. Porco, High Resolution Atlas of Rhea derived from Cassini-ISS images, Planetary and Space Science, doi: 10.1016/j.pss.2011.04.008.