Spectra obtained with APEX and the Mopra telescope toward the Cha I and III sources listed in Table 7, displayed in main-beam temperature scale. Spectra that were rescaled to fit in the figure have their scaling factor indicated on the right. The vertical dashed line marks the systemic velocity as derived from a Gaussian fit to the CH₃OH 2₀–1₀ A⁺ transition, except for sources Cha1-C6, Cha1-C24, Cha1-C27, Cha1-C35, and Cha3-C10 for which the C¹⁸O 2–1 transition was used.