LSCE :  Dr. Marc Delmotte
	Laboratoire des Sciences du Climat et de l’Environnement,  Gif sur Yvette Cedex, France

AGH:    Dr. Mirek Zimnoch
	Dep. of  Enivonmental Physics , AGH-Univ. of Science and Technology, Kraków, Poland

UHEI:   Dr. Ingeborg Levin
	Institute of Environmental Physics, University of Heidelberg, Heidelberg, Germany

SIO: 	Dr. Alan Bollenbacher /Dr. Ralph Keeling
	Scripps Institute of Oceanography, University of California – San Diego, San Diego, USA

CSIRO:	Dr Colin Allison 
	CSIRO Marine and Atmospheric Research, Aspendale, Victoria, Australia

EC:	Dr. Lin Huang
	Environment Canada, Stabile Isotope Research Laboratory, Downsview Ont. Canada

NIES: 	Dr. Hitoshi Mukai
	National Institute for Environmental Studies, Tsukuba, Japan

IRMM:	Dr. Sergey Assonov
	Institute for Reference Materials and Measurements, Geel, Belgium

U.Bern:	Dr. Markus Leuenberger
	Climate and Environmental Physics, University of Bern, Bern, Switzerland

INSTAAR:Dr. Bruce Vaughn / Dr. James White 
	Institute of Arctic and Alpine Research, University of Colorado, Boulder CO, USA

BGC:	Dr. Magnus Wendeberg / Dr. Willi Brand
	Max Planck Institute for Biogeochemistry, Jena, Germany