Schematic representation of the multiphase ISM in a galaxy. Left: radio emission observed in 3C 326 N with the Westerbork Synthesis Radio Telescope (WSRT) 21 cm (Willis & Strom 1978) and Spitzer/IRAC composite image (Ogle et al. 2007) at 3.6, 4.5, and 8.0 μm, showing the 3C 326 N galaxy (and its southern companion). The 3.7″ × 3.7″ (6.4 × 6.4 kpc) square (not-to-scale) represents the solid angle Ω_obs over which line emissions are observed. Center: cutout showing the projected proton density from a numerical simulation of the interaction between a radio jet and the central part of a multiphase galactic disk (from Murthy et al. 2022). The different colors show the parsec-scale multiphase structure, with the dense irradiated medium in red (n_H ≥ 10³ cm⁻³), the shock diffuse gas in yellow (i.e., n_H ∼ 10 − 10³ cm⁻³), and the hot X-ray plasma in green (n_H ∼ 1 cm⁻³). Right: simplified model used in this paper where the observational beam is supposed to encompass distributions of shock and PDR surfaces (see Fig. A.1).