This material for Westerman et al

This material for Westerman et al., 2004, has been published in Physical Geology of High-Level Magmatic Systems, C. Breitkreuz and N. Petford (eds.), Geological Society Special Publication, 234, 195-213, the only definitive repository of the content that has been certified and accepted after peer review. Copyright and all rights therein are retained by The Geological Society of London.