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Thanks -- +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ + Steve Lloyd Queen Mary, University of London + + E-mail: [log in to unmask] Physics Department + + Phone: +44-(0)20-7882-5057 Mile End Road + + Fax: +44-(0)20-8981-9465 London E1 4NS, UK + +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++