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Extreme value distributions. Bold curve: The elemental distribution, an exponential decay with a time constant of 1. Dashed curves: Probability of recall when that requires 2 or 5 such elements to be active. Continuous curves: Probability when any one of 1 (bold curve), 2, 3, 5, or 10 such elements suffice for recall (Equation 11). Superimposed on the rightmost curve is the best-fitting asymptotic Gumbel distribution.
