| Institution: | Institute of Astronomy and Astrophysics, National Observatory of Athens, I. Metaxa &B. Pavlou, Palaia Penteli, 152 36, Athens, Greece;Imperial College, Astrophysics Group, Prince Consort Rd, London SW7 2AZ;Kapteyn Institute, University of Groningen, Zernike Gebouw, Landleven 12, 9747 AD Groningen, the Netherlands;Astrophysikalisches Institut Potsdam, An der Sternwarte 16, D-14482, Potsdam, Germany;Instituto Nacional de Astrofisica, Optica y Electrónica (INAOE) Apartado Postal 51 y 216, 72000, Puebla, Pue., Mexico;Physics Department, University of Athens, Panepistimioupolis, Zografou, Athens, Greece |
