The Fermi surface (at two different energy levels) of the oxide PtCoO₂ is visualized as a large hexagonal electron cylinder, rotated 30° with respect to the Brillouin zone, with energy-dependent warping at corners.

From the article:

Unusual Transport and Strongly Anisotropic Thermopower in ${\mathrm{PtCoO}}_2$ and ${\mathrm{PdCoO}}_2$
Khuong P. Ong, David J. Singh, and Ping Wu
Phys. Rev. Lett. 104, 176601 (2010)

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