Figure 1
From: Geometric analysis of shape transition for two-layer carbon–silicon nanotubes

The distance distribution of all atoms from the center of the circle as the Z-axis changes. (a) Sliced CNT Graph, (b) Sliced SiNT Graph, (c) the distance distribution of all atoms from the center of the circle (0,0) after CNT relaxation for 0.5 ns, (d) the distance distribution of all atoms from the center of the circle (0,0) after relaxation of 0.5 ns for SiNT. ((a) and (b) are shown by Xiangyan Luo using python to track the flattest and roundest position after simulation and then rendered by a software in-house developed by Dr. Tian who is an author of this paper).