[23] This work was supported by the International Space Science Institute (ISSI, Bern, Switzerland, Team 70) and by the Russian Foundation for Basic Research (project 05-02-17096). The information on the proton fluxes obtained by the instrument CPME on board the IMP 8 spacecraft was taken from the Web site of this instrument (http://sd-www.jhuapl.edu/IMP/imp_index.html).
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