It is noted that the cathode temperature is not so high, the temperature being in {HEAD ~ a range} of {TAIL ~ the room temperature} to about 100 degrees Celsius at most 
of
It is noted that the cathode temperature is not so high , the temperature being in { HEAD ~ a range } of { TAIL ~ the room temperature } to about 100 degrees Celsius at most
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH