Department of Earth and Environmental Science, University of Munich, Theresienstr. 41/IV, Munich, D-80333 Germany ; Department of Physics, University of California, Davis, One Shields Ave, Davis, CA 95616 United States
Department of Physics, University of California, Davis, One Shields Ave, Davis, CA 95616 United States
Department of Physics, University of California, Davis, One Shields Ave, Davis, CA 95616 United States