Regions of our Herschel observations in ρ Oph A are superposed onto a greyscale and contour map of C¹⁸O (3–2) integrated intensity; see scale bar to the right (Liseau et al. 2010). The region mapped with HIFI in H₂O 557 GHz is shown by the large and partially cut rectangle (yellow; see also Fig. A.1) and that in H₂O 1670 GHz by the small rectangle (magenta). The green rectangle outlines the region mapped with PACS in the [O I] 63, 145 μm lines and in the far-IR continuum. The green polygon marks the perimeter of the O₂ 487 GHz observations. Yellow stars identify Class I and II sources, the red star the Class 0 source VLA 1623, and the white star the early-type object S 1 (B4 + K, Gagné et al. 2004). An arrow points towards the 11′ distant early B star HD 147889. The red and blue contours refer to high-velocity gas seen in CO (3–2) emission (JCMT archive). Zero offset is at the position of SM 1, i.e. for J 2000 coordinates RA = 16^h26^m279, Dec = −24°23′57′′.