Sentence:  The impact rate on 1958 Alpha for 153 events was * * f for particles of mass <WSD>greater</WSD> than * * f ( Dubin , 1960 ) ; this mass threshold was derived from the detector calibration and an assumed impact velocity of * * f . 
Meaning of the word marked with <WSD> tags:  relatively large in size or number or extent; larger than others of its kind