@Article{acpd-3-5185-2003, AUTHOR = {Rayner, P. J.}, TITLE = {Optimizing CO$_{2}$ observing networks in the presence of model error: results from TransCom 3}, JOURNAL = {Atmospheric Chemistry and Physics Discussions}, VOLUME = {3}, YEAR = {2003}, NUMBER = {5}, PAGES = {5185--5204}, URL = {http://www.atmos-chem-phys-discuss.net/3/5185/2003/}, ISSN = {1680-7367} }