1. Institute for Rock Magnetism, Department of Earth and Environmental Sciences, University of Minnesota, Minneapolis, MN, USA
2. Institute of Geophysics, ETH Zurich, Zurich, Switzerland
3. Institute of Geological Sciences, University of Bern, Bern, Switzerland
4. AGICO Inc., Brno, Czech Republic
5. Institute of Geology of the Czech Academy of Sciences, Prague, Czech Republic