G'day Walter The Underworld team have developed a Melt function. Is this melt function the one posted at: http://www.geodynamics.org/cig/workinggroups/long/workshops/gale-dev-mtg09 ? Cheers Patrice Dr Patrice F. Rey EarthByte Research Group School of Geosciences The University of Sydney +61 2 9351 2067 patrice.rey at mac.com