Iris Moebius (a,b), Oliver Friedrich (a,b), Kirsty M. Edgar (c) & Phil F. Sexton (d)
(a) Institute for Geosciences, Goethe-University Frankfurt, Altenhöferallee 1, 60438 Frankfurt, Germany. E-mail: moebius@em.uni-frankfurt.de
(b) Institute for Geosciences, University Heidelberg, Im Neuenheimer Feld 234-236, 69120 Heidelberg, Germany.
(c) School of Earth Science, University of Bristol, Wills Memorial Building, Queen's Road, Bristol BS8 1RJ, UK.
(d) Centre for Earth, Planetary, Space & Astronomical Research, The Open University, Milton Keynes MK7 6AA, UK.