In the FIG 4 embodiment, {TAIL ~ fluid coolant flow} through {HEAD ~ cooling channel} 46 removes heat from heat exchanger 40 
In the FIG 4 embodiment , { TAIL ~ fluid coolant flow } through { HEAD ~ cooling channel } 46 removes heat from heat exchanger 40
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH