You might also want to look at the ImageJ application,
http://rsb.info.nih.gov/ij/ which IIRC has a bunch of tools designed to pick out clusters, dots, etc. Carl ______________________________________________ R-help@r-project.org 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.
