Tom, There's a link on the Ch web site. Here it is: http://chileheads.netimages.com/ristra.html Tara -- ______________________________________________________ Tara Deen School of Geosciences Division of Geology and Geophysics Building FO5 University of Sydney NSW 2006 AUSTRALIA Phone: 61-2-9351 4271 Fax: 61-2-9351 0184 Mobile: 061 410 538 655 email: tara@es.usyd.edu.au ______________________________________________________