Financial support for TT and EP to work in Australia was provided by a Bilateral Science and Technology grant. Two authors (EP and TT) have also been supported by the ISF Grant (N0S000) and the RFBR Grant (96-05-64108). Support for BB has been provided by an ARC Small Grant. The data from 1992 were collected under an ARC Large Grant in collaboration with PH, Ray Steedman, and Chris Fandry. The 1995 data were collected from R. V. Franklin by PH in collaboration with Peter Craig and Miles Furnas. The numerical scheme described in the paper was developed in collaboration with Yuri Stepanyants.
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