... finds

This value of the limiting diffusion coefficient is larger than the value obtained for turbulent diffusion under the SB conditions, i.e. $v_{{\rm turb}}\la 10^{3}$ km s^-1 and $l_{0} \sim R_{\star} \sim 6$ pc. Therefore, it is legitimate to use the non-turbulent expression, Eq. (21), for the order of magnitude calculation.

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