1. Bureau of Economic Geology, The University of Texas at Austin, University Station, Box X, Austin, Texas 78713‐8924 U.S.A., alexandros.savvaidis@beg.utexas.edu, bissett.young@beg.utexas.edu, dino.huang@beg.utexas.edu
2. ALomax Scientific, 320 Chemin des Indes, 06370 Mouans‐Sartoux, France, anthony@alomax.net