{HEAD ~ A thermal resistor} can be provided between the outer fin 2 and {TAIL ~ the tube body} 1 
provided between
{ HEAD ~ A thermal resistor } can be provided between the outer fin 2 and { TAIL ~ the tube body } 1
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL REL OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH