{HEAD ~ The angle} β, which extends between {TAIL ~ the tangent} of the breakaway edge A and the perpendicular to the outlet plane of the tube 20, is the same size as angle β 
extends between
{ HEAD ~ The angle } β , which extends between { TAIL ~ the tangent } of the breakaway edge A and the perpendicular to the outlet plane of the tube 20 , is the same size as angle β
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL 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 OTH OTH