Illustration of the feasible regions of E(Y1) defined by formula (6). flow, f, and fup can be viewed as three functions of E(Y1) that correspond to the three terms in (6):
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.The two intervals on X-axis under the gray regions correspond to the feasible regions under ρ1>0 and ρ1<0, respectively. Here, θ1= 0.4, |ρ1| = 0.5, π = 0.5, ν1 = 0.5, μ1 = 0.25, ψ= 1, η1 = 0.15, b = 0.05, and d = 0.10625.