Sentence:  In the past two years, NASA's Kepler Space Telescope has located nearly 3,000 exoplanet candidates <WSD>ranging</WSD> from sub-Earth-sized minions to gas giants that dwarf our own Jupiter. Their densities <WSD>range</WSD> from that of styrofoam to iron. 
Meaning of the word marked with <WSD> tags:  Of a variable, to be able to take any of the values in a specified range.