Marginal distribution functions P(σ) and P(σ) for the function W(ς, σ) in the ς–σ phase space for different values of q and τ, where (a) τ = 0.5, and q = 1 (black solid line), q = 2 (red dashed line), q = 4 (green dotted line), q = 5 (blue dash-dotted line), q = 6 (cyan dash-dot-dotted line), q = 9 (magenta short-dashed line); (b) q = 4, and τ = 0.1 (black solid line), τ = 0.5 (red dashed line), τ = 1.2 (green dotted line), τ = 2 (blue dash-dotted line), τ = 4 (cyan dash-dot-dotted line), τ = 7 (magenta short-dashed line), τ = 20 (yellow short-dotted line), τ = 100 (dark-yellow short-dash-dotted line).