1. Instituto Argentino de Nivología, Glaciología y Ciencias Ambientales; CONICET; Av. Ruiz Leal s/n Parque Gral. San Martín C.C. 330 5500 Mendoza Argentina
2. Tree-Ring Lab; Department of Forest and Conservation Sciences; University of British Columbia; 2424 Main Mall Vancouver BC V6T 1Z2 Canada
3. Swiss Federal Research Institute WSL; Zürcherstrasse 111 CH-8903 Birmensdorf Switzerland