algorithm returns the appropriate values, specifically, $\alpha_P = \alpha_{RP}
= -1.58$ and relative reddening $E_R = E_{RP} = 0$. The nonBAL composite is slightly bluer[^5] ($\alpha_P = -1.61$) than the EDR composite spectrum ($\alpha_P = -1.58$) and is best fit by lower reddening values than the EDR composite. This result is to be expected if BALQSOs are redder than nonBALQSOs since the EDR composite spectrum includes BALQSOs.

We find that both the HiBAL and HiBAL+LoBAL composite spectra are redder than the nonBALQSO composite spectrum, having power-law fits with spectral indices $\alpha_P = -1.39$ and $-1.29$, respectively. In addition, for the $R$-fit model, both of these composites require reddening relative to the EDR composite spectrum: $E(B-V)=0.023$ and $0.032$, respectively. The redder values for the HiBAL+LoBAL composite spectrum suggest that the LoBAL population is redder than the HiBAL population. Indeed, the LoBAL composite spectrum has the reddest power-law-only fit, $\alpha_P=-0.93$, and requires the largest correction for the dust-only fit, $E_{R}(B-V)=0.077$. A large reddening value is also required for the $RP$-fit of the LoBAL composite. However, the interpretation of $RP$-fit values is less clear, and we are reluctant to place any absolute physical importance on these values due to the degeneracy described above 