CH₂DOH population diagrams of dM-1 and dM-2. a, b) Population diagrams of the high angular resolution data. The rotational temperatures are assumed to be 130 K and 85 K for dM-1 and dM-2, respectively. c, d) Population diagrams for the data smoothed to a resolution of . Low rotational temperatures and higher ones are assumed to be 60 K and 130 K for dM-1 and 66 K and 85 K for dM-2, respectively. The fits of low temperatures are plotted in black lines and higher temperatures in blue dashed lines. The CH₂DOH column densities are estimated by a least-squares fit, where the uncertainties include the statistical error, the rms noise, and calibration uncertainties (10%).