Hi Ralf I am off the lab but I'll get back to you when I am back on thursday. Nick ______________________________ Dr Nicolas ARNAUD, PhD Chargé de recherche UMR 6524 CNRS lab. "Magmas et Volcans" 5 rue Kessler 63000 Clermont-Ferrand France Tel: (33 0) 473 34 67 11 Fax: (33 0) 473 34 67 44 e-mail: [log in to unmask] Web Server:http://wwwobs.univ-bpclermont.fr/lmv/index.html