Hα line luminosity as a function of R_BB (top panel) and T_BB (bottom panel). The dashed lines are the best fits for the data; linear for R_BB and inverse power-law for T_BB. The dotted-dashed line in the bottom panel is an inverse power-law fit with the exponent fixed at 2. Hα luminosity seems to follow a linear relationship with the blackbody radius (L_Hα ∝ R_BB) and potentially an inverse power-law relationship with blackbody temperature ().