Height of the gap (thick solid curves), proton (thin solid curves), and mean electron (dashed curves) energies in the gap as a function of the latitude θ for a black hole of the mass M = 3 × 10⁹M_⊙, embedded in RIAF with “low” luminosity L = 8 × 10⁴⁰ erg/s, magnetic field B = 10³ G (red curves), and “high” luminosity L = 5 × 10⁴³ erg/s, B = 10² G (blue curves). Electron and proton energies are almost independent of the latitude θ.