1. Department of Forest Ecology and Management, Swedish Agricultural University, SE-901 83 Umeå, Sweden
2. Swedish Nuclear Fuel and Waste Management Co. (SKB), Box 250, SE-101 24 Stockholm, Sweden
3. Geological Survey of Sweden (SGU), PO Box 670, SE-751 28 Uppsala, Sweden
4. Freshwater Biological Laboratory Department of Biology University of Copenhagen, Universitetsparken 4, DK-2100 Copenhagen, Denmark
5. AMS 14C Dating Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark