As a proxy for the CH₃OH/H₂CO abundance ratio, we here show the line ratio between the CH₃OH 4₂ → 3₁, E line at 218.440 GHz and the H₂CO 3₀₃ → 2₀₂ line at 218.222 GHz in the CrA sources as a function of the H₂CO rotational temperature. CrA-24 and SMM 2 are shown with two data points each, one for the on-source component (blue) and one for the outflow component (red). (A colour version of this plot is available in the online Journal.)