Top panels: Plasma-β Carrington maps for CR 2074 (left), and CR 1979 (right). Contour lines show the value of plasma-β corresponding to β = 1 (solid white lines) and β = 0.1 (dashed white lines). Bottom panels: Alfvén speed maps for CR 2074 (left), and CR 1979 (right). Contour lines show the value of V_A corresponding to V_A = 200 km s⁻¹ (solid white lines) and V_A = 1000 km s⁻¹ (dashed white lines).