Ionization profiles for the objects W49B a), W44 b), 3C 391 c), and CTB 37A d), induced by CRs (black, solid lines), as well as X-ray spectra extrapolated toward lower energies by a power-law (red, short-dashed lines), by a constant (gray, long-short-dashed lines), and without extrapolation (purple, long-short-short-dashed lines), respectively.