Comparison of the spectra, using the restricted fit, of the best-fitting T4.5 to T7.5 field brown dwarfs to 51 Eri b. The spectra shown in this figure are a subset of the data plotted in Figure 6. The brown dwarf spectral fits plotted here use the restricted chi-squared equations presented in Equation (2). The T4.5 and T5.0 spectra are from Looper et al. (2007), the T5.5 is from Burgasser et al. (2008), the T6.0 is from Burgasser et al. (2004), the T6.5 and T7.5 are from Burgasser et al. (2006), and the T7.0 is from Dupuy & Liu (2012).