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B(0,0,0), (1/3,2/3,1/2) and
N(0,0,u), (1/3,2/3,u+1/2), where u is the dimensionless internal
parameter that represents the distance between the B plane and its
nearest-neighbor N plane, in unit of c

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  N   0.2500000000000000   0.2500000000000001   0.2499999999999999


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