Optical photometry of the UCM Lists I and II - I. The data P. G. Pérez-González, J. Zamorano, J. Gallego and A. Gil de Paz Astron. Astrophys. Suppl. Ser., 141 3 (2000) 409-421 Published online: 15 February 2000 DOI: 10.1051/aas:2000323