Top: visualization of 3D magnetic field energy using simulation A1 at t_r ≃ 0.8 Myr. We highlight high-intensity structures, i.e., their corresponding intensity is five times larger than the global mean value. Bottom: visualization of magnetic field’s orientation (left, blue vectors) and velocity’s direction (right, red vectors). Note that this subregion exhibits high magnetic field energy and the velocity indicates the direction of convergent flow. Units of energy and volume density are M_⊙ pc² Myr⁻² and M_⊙ pc⁻³, respectively.