H₂O lines observed in Arp 299A with SPIRE. The black histograms are the observed, continuum-normalized, spectra. 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, and the solid red curve denotes the sum of the models. Gray histograms are the residual spectra after model subtraction.