Fig 1. Examples of fu and fl.
The panels show functions fl(g[ϕ]) and fu(1 − g[ϕ]). In the left panel fl(g[ϕ]) = fu(g[ϕ]) = log g[ϕ] while in the right panel fl(g[ϕ]) = fu(g[ϕ]) = log(g[ϕ]/(1 − g[ϕ])).
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