Intrinsic FWHM of molecular lines detected in 4C12.50. The solid and open triangles for S(3) (1–0) are the values from Tables 2 and 3 respectively. The two green open squares are ALMA CO(2–1) measurements for the nuclear (top, 0.1″ radius aperture) and integrated (bottom, 1.5″ radius aperture) spectra (Lamperti et al. 2022). The solid horizontal black line marks FWHM_* = 392 km s⁻¹ (Dasyra et al. 2006). The coloured areas correspond to the FWHM (± errors) of the narrow (systemic) component of Paα (red) and the optical (green) ionised gas lines. D12: Dasyra & Combes (2012); D14: Dasyra et al. (2014); G12: Guillard et al. (2012); I16: Imanishi et al. (2016); I18: Imanishi et al. (2018).