PACS maps of H₂O line fluxes (increasing upper-level energy from top left to bottom right). First contour corresponds to the 1σ flux level of each transition. The contour step is 2σ in all lines except for the o-H₂O (2₁₂ − 1₀₁) and o-H₂O (3₀₃ − 2₁₂), for which the contour step is 6σ and 3σ, respectively, where σ is listed in Table 2. The top right panel shows an overlay of the o-H₂O (2₁₂ − 1₀₁) map (gray scale) with the PdBI CH₃CN (8–7) K = 0–2 image (red contours) from Codella et al. (2009) tracing the bow-shock. The synthesized beam of PdBI, × (PA = 10°), is shown in the bottom right corner of this panel. Plus signs mark the central position of each spaxel of the PACS field of view. The white triangle indicates the position of the CO peak traced by high-J_up PACS lines (Benedettini et al. 2012) and the × symbol depicts the nominal position of the B1 shock. The half power beam width (HPBW) of each transition is indicated in the bottom right corner of each panel and is listed in Table 2.