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