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