Top panel: photometry of 51 Eri A from the literature, and from the results presented in this study (solid symbols). One hundred models were randomly selected from the MCMC search and are plotted (translucent black curves). For each model, the synthetic magnitude was calculated for each filter. The median value for each filter is shown as an open square. The 2MASS photometry points are plotted to illustrate the offset relative to the new MKO measurements and are not included in the fit. For the plotted Geneva photometry, we computed the Geneva V-band photometry using the best-fit spectrum and then used the color relations to calculate the photometry in the remaining filters. Bottom panel: the fractional residuals relative to the median model. The data used to create this figure are available.