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P.8 line 34: "The size of the nano-crystallites was quite uniform¡­" - how was this ascertained? The presented SEM micrographs do not allow establishing that, as well as the calculations from XRD analysis are not an argument (it could be a coincidence with the particles' average size).

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The size of the nano-crystallites was quite uniform and was estimated around 13 nm, which is consistent with the XRD testing value shown in Table 3.


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