Hubble type $T$ and the adopted distance modulus and its uncertainty. The average distance for the sample galaxies is $21.6
{\>{\rm Mpc}}$. This corresponds to $\langle z \rangle = 0.005$, given the Hubble constant listed in Section \[s:intro\].

There are 6 spiral galaxies with bulges in common between the SBF sample of T01 and the sample of galaxies for which Cepheid distances are available from the HST Cepheid Key Project. T01 calibrated the zeropoint of their SBF method so as to set to zero the [*median*]{} SBF vs. Cepheid distance modulus residual for these 6 galaxies (see Appendix B of Tonry [[et al. ]{}]{}2000). This was done using Cepheid results available in 2000. These Cepheid distances have since been improved (Freedman [[et al. ]{}]{}2001). Application of the same calibration methodology to the new Cepheid distances implies an SBF zeropoint that is larger by $+0.06$ mag (e.g., Mei [[et al. ]{}]{}2005). To account for this, we added a correction $\Delta_{\rm T01} = -0.06$ mag to all the distance moduli in T01 (i.e., moving the galaxies closer).

For the purposes of our study it is important to understand the accuracy with which the SBF and Cepheid distance scales have been aligned. If 