“Infall” signature toward cores in Cha I. The optically thick, self-absorbed transitions are shown with black thick lines and the optically thin transitions with red thin lines. The dashed red line shows the systemic velocity of each core derived from a Gaussian or hyperfine-structure fit to the optically thin line shown in red. The name of the cores is given on the right-hand side of each transition depicted. The factor by which each spectrum was multiplied is given next to the name of the transitions and it corresponds to 1 if not specified.