Snapshot of H₂ density (top), gas temperature (second), H₂ abundance (third), and poloidal velocity (bottom). Cyan contours indicate isosurfaces for each quantity: n_H2 = 10, 10², 10³, 10⁴, 10⁵, 10⁶, 10⁷cm⁻³; T = 200, 500, 1000, 2000, 3000, 5000K; y_H2 = 10⁻⁴,10⁻³,10⁻²,10⁻¹; and v_p = 1,2,5,10,20,30km s⁻¹. In all panels, the white and green dashed contours denote the H₂ dissociation front (y_H2 = 0.25) and the isothermal sonic surface, respectively. White arrows indicate the velocity field (direction only, not its magnitude) and are omitted where T < 100K. In the H₂ abundance map, the dotted gray contour marks the HI ionization front (y_HII = 0.5).