The pink line indicates the Fermi surface from local density
approximation calculations done in 1987; see
W. E. Pickett, Rev. Mod. Phys.W. E. Pickett, Rev. Mod. Phys.W. E. Pickett, Rev. Mod. Phys.
**61**, 433-512 (1989), espeicallyFigure 19 on page 453.