Rotation diagrams for well-isolated lines of CH₃OD (upper panel) and CH₃CHDOH (lower panel). For the former, both rotation temperature and column density can be constrained, while the limited range of CH₃ OD transitions only allow us to constrain the column density for that species. In both panels, the best fit is shown with the solid line with our conservative estimates on the uncertainties represented by the dotted lines (the best fit values given in the upper right corner of each panels). The dashed lines in both panels indicate the best fits assuming a fixed rotation temperature of 125 K: this temperature clearly does not match the data for CH₃ OD over the range of upper energies for the observed lines.