(a) TEM bright field morphology of a B₄C FTNW with diameter of 92 nm. (b) 3D intensity reconstruction about (112) and (113) reflections of the B₄C FTNW shown in panel (a). In this 3D data set, the direction, Z, is parallel to the twinning axis of the B₄C FTNW, and the direction, X, is parallel to the tilting axis for conducting the systematic tilting electron diffraction. According to the 3D reconstruction result shown in panel (b), the g₍₀₀₁₎ recirprocal vectors of the five single crystalline segments, T1∼ T5, are deduced and illustrated by black solid lines with arrows in panel (c). In panel (c), the red dots represent the ending points of g₍₀₀₁₎ vectors projected on X–Y, X–Z, and Y–Z reciprocal planes, respectively. (d) The projections of the five g₍₀₀₁₎ vectors on the X–Y reciprocal plane which is perpendicular to the twinning axis of the nanowire, i.e., Z direction.