Top panel: Gaussian decomposition of the o-H₂O (1₁₀−1₀₁) spectrum toward the source l59-441. The individual Gaussian components are shown with solid color lines overlaid on the (continuum-subtracted) spectrum. The overall Gaussian fit is shown with a red dashed line, and the residual deviation at a velocity of ≃55 km s^-1 is visible. The intensity of the component in absorption has been multiplied by a 0.2 factor. Bottom panel: overlay of the o-H₂O (1₁₀−1₀₁), o-NH₃ (1₀−0₀) and N₂H⁺ (6−5) lines toward the source l59-441.