Points 1, 2, 3, 4 originally had irregular ascending y-coordinates, which were transformed and rescaled to an arithmetic progression from -1 to 1 by coordinate-wise ...
Schematic diagram of the coordinate transformation process in cylinder structure. (A), (D), (C), and (F) Cartesian coordinates. (B) and (E) Curvilinear coordinates. The red lines denote isotherms.