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