{TAIL ~ Data} obtained from pressure and flow rate for test and reference fluids are used to calculate percent change in permeability and actual permeability using {HEAD ~ Darcys Law} 
{ TAIL ~ Data } obtained from pressure and flow rate for test and reference fluids are used to calculate percent change in permeability and actual permeability using { HEAD ~ Darcys Law }
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD