A simple work around is to just add some random noise to the points with jitter.
?jitter -- Dr Duncan Golicher Ecologia y Sistematica Terrestre Conservación de la Biodiversidad El Colegio de la Frontera Sur San Cristobal de Las Casas, Chiapas, Mexico Email: [EMAIL PROTECTED] Tel: 967 674 9000 ext 1310 Fax: 967 678 2322 Celular: 044 9671041021 United Kingdom Skypein; 020 7870 6251 Skype name: duncangolicher Download Skype from http://www.skype.com _______________________________________________ R-sig-Geo mailing list R-sig-Geo@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-geo
