Sentence:  Not all the observers have used the same procedures or made the same assumptions about the lunar brightness distribution when reducing the data , and this , together with differences in the methods of calibrating the antennae and receivers , must account for much of the disagreement in the measured radio brightness <WSD>temperatures</WSD> . 
Meaning of the word marked with <WSD> tags:  the degree of hotness or coldness of a body or environment (corresponding to its molecular activity)