Fig. 4.

Electronic phase diagram of Bi₂Sr₂CaCu₂O_8+δ versus hole doping, δ. Brown dots indicate incoherent gapped spectra, blue points coherent gapped spectra, green dots coherent gapless spectra, and red dots incoherent gapless spectra. The brown double triangles denote T^∗, and the green double triangles T_coh. T_c denotes the transition temperature into the superconducting state (shaded gray and labeled D-wave SC).