Spectral line image of the ρ Oph cloud (L 1688) in the H₂O (1₁₀−1₀₁) 557 GHz line obtained by Odin with its 2′ beam, which is indicated to scale in the lower left corner. The colour-coding for the integrated intensity is shown by the scale bar in the lower right. The cores A through F are labelled, and the Odin data are superposed onto the contours of integrated C¹⁸O(J = 1–0) emission from Umemoto et al. (2002). The J2000-coordinates of the (0, 0) position are RA = 16^h26^m246 and Dec = −24°23′54′′ and offsets are in seconds of arc. The Herschel beam at 557 GHz is shown next to that of Odin and the inclined, semi-transparent rectangle outlines the region mapped with HIFI.