Tuğrul Hakioğlu Department of Physics Bilkent University 06800 Ankara, Türkiye e-mail: hakioglu [at] fen.bilkent.edu.tr Tel: +90 312 290 2109 Fax: +90 312 266 4579 Teoman Turgut Feza Gürsey Institute Emek Mh. Rasathane Yolu, No: 68 34684 Çengelköy, Istanbul, Türkiye e-mail: turgut [at] gursey.gov.tr Tel: +90 216 308 9432 Fax: +90 216 308 9427