CO2 self diffusion coefficient

Dear Aidan,
Please see this article (below link) and the attached file, which says that diffusion coefficient of CO2 is of 10^8 order. Please help me if I understand it wrongly. Thanks

http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-66321999000300010

self_diffusion_coefficient.pdf (51.1 KB)