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illustrated in the snapshot of this boundary in Fig. 4, thick and extended regions of disorder up to a nanometer or more in thickness are often observed in part of the boundary, with much narrower, more ordered regions in between. For the remainder of this section we will focus on the behavior of the two Σ9 boundaries, showing that the temperature dependence of the width histograms can be accurately described by the disjoining-potential formalism described above. 

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