Contour plots of key ISM parameters in the local Galactic disk plane near embedded astronomical structures. The radii of the dashed magenta circles represent the characteristic size of the embedded structures. Panel (a): log₁₀ of the total magnetic field strength, B₀ (μG), featuring diamagnetic depletion in the H II region and shell-like compressions at the SWB and SNR. Panel (b): log₁₀ of total ion number density, n_i0 (cm⁻³). Panel (c): log₁₀ of electron temperature T_e0 (K). Panel (d): log₁₀ of plasma β. High-β (β > 1) regions are masked in cyan, while ultra-low-β (β < m_e/m_i) regions are masked in green. The H II region is centered at (R, Z)≈(4, 0) kpc, SWB at (7, 0) kpc, and SNR at (10, 0) kpc. Note that the background field in panel (a) is normalized to a microgauss scale to match the 1D profiles in Figs. 2 and 3.