There were neither nor oxygen vacancies in nearest
neighbor position (see the .dlsub file).
This is the result for this run:
It does not look very nice at all (at least wrt 19990614 and 19990617).
I took two diffusion coefficient values in two different time intervals of the oxygen core MSD plot (see 19990614 for procedure):
The two values appear much higher than those in 19990614 and
19990617.
The intercept for the straight line fitted at larger times comes out negative: this sounds no good, as it should be related to the Debye-Waller factor. See figure 3 in ref. [2] for a similar example.