Spin-up rate (top panel) and radiative efficiency ϵrad/fatt (bottom panel) as a function of the MBH spin for the thin disc solution (Shakura & Sunyaev 1973) applied to the quasar mode. At negative values of the MBH spin, the gas accreted from the thin accretion disc decreases the MBH spin, while for a positive MBH spin, the gas increases. For the thin disc solution, the radiative efficiency is an increasing function of the MBH spin with a sharp increase (by 4) between a MBH spin of 0.7 and 0.998.
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