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