Observed NH₃ rotational temperature between the (1,1) and (2,2) inversion transition is shown against modelled NH₂D rotational temperature between the 1₁₁–1₀₁ line at 110 GHz and the 2₁₂–2₀₂ transition at74 GHz. Sources with a detected 74 GHz line are marked in red, and non-detections with an upper limit of the NH₂D temperatureare labelled as black arrows. The straight line corresponds to equal temperatures.