Figure 2:

Simulation I results: the RLR (panels (a)-(d)), OLS (panels (e)-(h)), Lasso (panels (i)-(l)), Fused Lasso (panels (m)-(p)) and Envelope (panels (q)-(t)) estimates of coefficient matrices from a randomly selected training dataset with n = 500, ρ₁ = 0.5, ρ₂ = 0.5 and σ² = 25: ${\widehat{\mathbf{B}}}_1$ (the first column); ${\widehat{\mathbf{B}}}_2$ (the second column); ${\widehat{\mathbf{B}}}_3$ (the third column); and ${\widehat{\mathbf{B}}}_4$ (the fourth column).