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