Solution for a combination of shocks and PDRs, assuming an exponential probability distribution function. Panel (a): distance vs. the medium’s density. The dashed line represents a 0.5 dex limit (i.e., a factor of 3 difference between observed and modeled line intensities) to guide the eye. Panel (b): derived mechanical-reprocessed luminosity from Eq. (6) as well as the UV-reprocessed luminosity from Eq. (8) as a function of density are shown in green and orange, respectively. The green area represents < 1% of the estimated jet kinetic luminosity of 3C 326 N, while the orange area represents the SED estimation of the reprocessed UV-luminosity (see Appendix C).