Map of the water 179 μm emissionin the blue outflow lobe of the HH 211 low-mass Class 0 source (L_bol ≈ 3.6 L_⊙, d = 250 pc) compared with that of other lines observed with Herschel-PACS. The color maps present, from left to right: a high-J CO line, the OH 119 μm doublet, the [O I] 63 μm line and the H₂O 179 μm line overlaid with a low-J CO (J = 2–1) line. The H₂O map is overlaid in light gray contours on the other panels. Note the similarity between the H₂O and CO high-J maps, but not with CO low-J. Data from Tafalla et al. (2013); Dionatos et al. (2018).