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