1. Department of Earth Science and EngineeringImperial College LondonSouth Kensington CampusLondonSW7 2AZ UK
2. School of GeoSciencesUniversity of EdinburghKing's BuildingsEdinburgh UK
3. Centre for Electron Nanoscopy, Technical University of DenmarkKongens Lyngby Denmark
4. Ernst Ruska‐Centre for Microscopy and Spectroscopy with Electrons and Peter Grünberg InstituteForschungszentrum JülichJülich Germany