Spectra of the ND (N = 1–0, J = 2–1) (a) and (N = 1–0, J = 1–1) (b) lines toward the SW image of PKS 1830−211, observed with ALMA in July 2019. The hyperfine structure and the best fits with one single Gaussian velocity component are shown. c: corresponding ND opacity profile fitted with one Gaussian velocity component (see Table 3), normalized for an equivalent transition of line strength = 1.