{HEAD ~ The tilt angle} may be, for example, up to {TAIL ~ about 45°} 
up to
{ HEAD ~ The tilt angle } may be , for example , up to { TAIL ~ about 45 ° }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL