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In Papers I-II, we derived the expressions for the turbulent diffusivities of momentum, temperature T , and mean molecular weight μ. Since the scalar T -μ fields are active tracers (by influencing the density and thus the velocity field), whereas passive tracers such as 7 Li are carried along by the flow without influencing it, it would be unjustified to use the diffusivities of the T -μ fields to represent the diffusivity of passive tracers. In this paper, we present the first derivation of adoi:10.1051/0004-6361/201015372 fatcat:rm3swx6tdjcpxnxeydzkiszdwa