Institution: | (1) J F Allen Research Laboratories, School of Physics and Astronomy, University of St Andrews, St Andrews, Fife KY16 9SS, UK (Fax: +44-1334/463-104), UK;(2) Leysop Ltd, 17 Repton Court, Repton Close, Burmills, Basildon, Essex SS12 1LN, UK (Fax +44-1268/522-111), UK |