H₂O and OH lines observed in Arp 299A with PACS. The black histograms are the observed, continuum-normalized, spectra. The velocity scale for the OH lines refers to the blue component in each doublet. The best fit models from Sect. 3 are also included. The dashed blue and dashed-dotted green curves denote the models for the inner and outer components, respectively. The dotted magenta curve in the OH spectra represents the tentative extended component and the solid red curve denotes the sum of the models. Gray histograms are the residual spectra after model subtraction.