{TAIL ~ This radius R} runs up to the outlet plane of the tube 20, the angle β between the start and end of {HEAD ~ the curvature} being 3 mm 
{ TAIL ~ This radius R } runs up to the outlet plane of the tube 20 , the angle β between the start and end of { HEAD ~ the curvature } being 3 mm
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 HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH