image/svg+xml - 3 - 2 - 1 1 2 3 - 3 - 2 - 1 φ μ,σ 2 ( 0.8 0.6 0.4 0.2 0.0 −5 −3 1 3 5 x 1.0 −1 0 2 4 −2 −4 x ) 0, μ = 0, μ = 0, μ = −2, μ = 2 0.2, σ = 2 1.0, σ = 2 5.0, σ = 2 0.5, σ =