(a) Variation of bolometric luminosity (in ergs s⁻¹) and (b) efficiency (in %) as a function of Ṁ (in units of Eddington rate, Ṁ_edd). Colour bar indicates the spectral index (α). The BHs of different masses: 10 M_⊙ (small circle), 10³ M_⊙ (medium circle), and 10⁶ M_⊙ (largest circle) are represented with increasing sizes of the circles. The parameters used here are E = 1.001 and λ = 2.4.