Plot of log distance in Mpc vs. log redshift for Cepheids, the Tully‐Fisher relation, Type Ia supernovae, surface brightness fluctuations, fundamental plane, and Type II supernovae, calibrated as part of the Key Project. Filled circles are from Birkinshaw (1999), for nearby Sunyaev‐Zeldovich clusters with ﹩cz< 30,000﹩ (﹩z< 0.1﹩) km s⁻¹, where the choice of cosmological model does not have a significant effect on the results. The SZ clusters are Abell 478, 2142, and 2256, and are listed in Birkinshaw’s Table 7. The solid line is for ﹩H_{0}=72﹩ km s⁻¹ Mpc⁻¹, with the dashed lines representing ±10%.