In {HEAD ~ fact}, the heating system only provides {TAIL ~ heat} for the perfume reaching the top contacting surface of the wick member 
In { HEAD ~ fact } , the heating system only provides { TAIL ~ heat } for the perfume reaching the top contacting surface of the wick member
OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH