The very reddened open clusters Pismis 23 (Lyngå 10) and Stephenson 2 S. Ortolani, E. Bica, B. Barbuy and Y. Momany A&A, 390 3 (2002) 931-935 Published online: 14 August 2002 DOI: 10.1051/0004-6361:20020716