Therefore, {TAIL ~ the porosity} of the base is {HEAD ~ more preferably 90% to 96%} 
Therefore , { TAIL ~ the porosity } of the base is { HEAD ~ more preferably 90 % to 96 % }
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD