Quantitatively, {HEAD ~ the size} of {TAIL ~ the radius R} can be defined in such a way that it is >10% of the inside diameter d of the tube 20 
of
Quantitatively , { HEAD ~ the size } of { TAIL ~ the radius R } can be defined in such a way that it is > 10 % of the inside diameter d of the tube 20
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL 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