1. Institute of Geological Sciences Polish Academy of Sciences Research Centre in Warsaw Twarda 51/55 00‐818 Warsaw Poland
2. Helmholtz‐Zentrum Potsdam Deutsches GeoForschungsZentrum GFZ Telegrafenberg 14473 Potsdam Germany
3. Helmholtz‐Zentrum Berlin Elektronenspeicherring BESSY II Albert‐Einstein‐Str. 15 12489 Berlin Germany