The angles are in {HEAD ~ the range} of {TAIL ~ 30° to 50°} with 40° preferred 
of
The angles are in { HEAD ~ the range } of { TAIL ~ 30 ° to 50 ° } with 40 ° preferred
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH