H₂O 3₂₁ − 2₁₂ 75 μm (left) and H₂O 3₂₁ − 3₁₂ 1163 GHz (right) profiles in seven Galactic high-mass star-forming regions, as observed with Herschel/PACS and SPIRE. The apodized SPIRE profiles also include the blend of CO 10-9 (which dominates the observed emission), H₂O 3₁₂ − 2₂₁, and HCN 13-12. The PACS spectra correspond to the central 3 × 3 spaxels (≈30″ × 30″). In Orion KL, the H₂O 75 μm line is observed in absorption toward the HC, as seen within the central PACS spaxel (≈10″ × 10″), but shows P Cygni and emission profiles for larger FoVs and toward Peak 1 (upper left panel; see also the insert in Fig. 2a).