For all GRASS folks! Sorry for my german mails, its must be a mistake in my reply function, the mail was only for Andreas Holz!!! Beg youre pardon!!! Andreas -- Andreas Schmidt, IPF-Universitaet Karlsruhe, Englerstr. 7, D-7500 Karlsruhe Telefon: +49 721 608 3676 Fax: +49 721 694568 Internet: schmidt at ipf.bau-verm.uni-karlsruhe.de