For {TAIL ~ a given source pressure}, {HEAD ~ the loose fill insulation} has a characteristic pressure drop for a given density 
For
For { TAIL ~ a given source pressure } , { HEAD ~ the loose fill insulation } has a characteristic pressure drop for a given density
REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH