To obtain the
distances more accurately, 10 dots in the edge and in the
middle of the tube were measured. Both measured distances
are illustrated in Fig. 3. The distance of 38 Å wasmeasured on
the edge of the nanotube and so one lattice parameter should
be 3.8 Å. In the middle of the tube, the obtained distance was
30 Å—the other lattice parameter should be 3 Å.