Colour image: the C¹⁸O(3−2) integrated intensity map of ρ Oph A cloud core from Liseau et al. (2010). The intensity scale is shown to the right. Contours: the 1.3 mm continuum data by Motte et al. (1998). The contours start at 0.15 Jy with subsequent contours at every increment of 0.15 Jy. The flux densities are given in a 15″ beam. We show the positions of the mm peaks from Motte et al. (1998) and the C¹⁸O peaks of Liseau et al. (2010). The map offsets are given relative the position α(J2000) = 16^h26^m27.2^s and δ(J2000) = -24°23′34″.