Systemic velocities of the cores in Cha I overplotted on the 870 μm continuum emission map obtained with LABOCA (Belloche et al. 2011a) for the transitions: a) C¹⁸O 2–1, b) C¹⁷O 2–1, c) CH₃OH 2₀–1₀ A⁺, and d) N₂H⁺ 1–0. The contour levels correspond to a, 2a, 4a, 8a, 16a, 32a, with a = 48 mJy/21′′-beam (4σ). The core velocities were derived from Gaussian or hyperfine-structure fits to the observed spectra. The filled circles are colour-coded and increase in size to emphasize increasing velocities. Cores with two velocity components are shown with the lower velocity overplotted onto the higher velocity component. The dashed arrow indicates the position angle of the velocity gradient fit.