Figure 1
Illustration: Adapted from Ref. [11]

Figure 1: (a) A schematic Fermi surface extracted from quantum oscillation measurements by Sebastian et al. The authors argue that they can extract from the data both electron and hole pockets (α and β are hole pockets, and γ are electron pockets). (b) Reconstructed Fermi surface for incommensurate SDW order in low-disorder ortho-II phase of YBCO6+δ.