I will be out of the office starting Wed 02/01/2006 and will not return until Sat 02/07/2060. I have left the SGDP. I am contactable at [EMAIL PROTECTED] ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.