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Efficiency as a function of h* for (a) A*=5.05, 1 ≤ AR ≤ 5 and Li = 0.3, (b) AR = 3.3, 1 ≤ A* ≤ 6 and Li = 0.3, (c) A* = 5.05, AR = 3.3 and 0.2 ≤ Li ≤ 0.6. Colours from black to white correspond to small to large values, respectively, for AR, A* and Li.
