Fig. 4.
He concentration profile in the opposite vessel, experimental vs. fitted curve The dashed lines are the calculated results for Dapp 25% larger (upper line, Dapp 15.3 ∙ 10− 10 m2/s) en 25% smaller (lower line, Dapp 9.15 ∙ 10− 10 m2/s) than the value obtained as best fit (Dapp 12.2 ∙ 10− 10 m2/s).