Figure 3

Effect of the z-score offset. Wavelet thresholded z-score map (a1, a2, a3), and bump model for offsets ϕ ∈ [-1..5] (b1, b2, b3, c1, c2, c3). Left: wavelet negative z-score maps (a1, a2) were first modeled until eight bumps were obtained (b1, b2), then continued until completion (c1, c2). If the z-score offset is too high (a2), the map is not well fitted (c1 vs. c2). Right: wavelet negative z-score map (a3), and its bump model (b3, c3). The modeling was performed first until 30 bumps were obtained (b3), then continued until completion (c3). Negative z-score events are shorter than positive ones (a1, a2 vs. a3), which leads to the modeling of more events (b1, b2 vs. b3).