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