Sentence:  The results of present observations of the thermal radio emission of the moon <WSD>are</WSD> consistent with the very low thermal conductivity of the surface layer which was derived from the variation in the infrared emission during eclipses ( e.g. , Garstung , 1958 ) . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)