Fig. 4. Distributions of the span Δ pour different values of the number r of event dates in a NSBC phase model with: Ta ≤ α ≤ θ1, . . . , θr ≤ β ≤ Tb. When r is small (r = 2, 3, 4), the densities are very high for Δ near zero, reflecting a high concentration effect. NSBC = Naylor-Smith-Buck-Christen
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