Figure 4.
Plots of the function f (w) = ɛ1βw2 / (1 + βw2) + ɛ2w2 and its derivative f′(w) = 2ɛ1βw / (1 + βw2)2 + 2ɛ2w, where ɛ1 = 0.1, ɛ2 = 10−5, and β = 10 for (a,b) and ɛ1 = 0.1, ɛ2 = 10−6, and β = 10 for (c,d).
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