All computations were performed on the CRAY C98 at the Academic Computing Center (SARA), Amsterdam, the Netherlands. Use of these computing facilities was sponsored by the Stichting Nationale Supercomputer Faciliteiten (National Computing Facilities Foundation, NCF) with financial support from the Nederlandse Organisatie voor Wetenschappelijk Onderzoek (Netherlands Organization for Scientific Research, NWO). We thank Peter Duynkerke for his valuable comments and Sheila McNab for her editing assistance. We also thank Jan Primus for creating an atmosphere that facilitated the discussions.
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