Techniques for measuring {HEAD ~ a density} of {TAIL ~ a liquid} within a fluid that includes both a liquid and a gas are described 
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Techniques for measuring { HEAD ~ a density } of { TAIL ~ a liquid } within a fluid that includes both a liquid and a gas are described
OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH