The exhaust gas temperature (E.G.T ) indicator on a gas turbine engine provides a relative indication of the
•  turbine inlet temperature.
•  temperature of the exhaust gases as they pass the exhaust cone.
•  exhaust temperature.

Diverdeep asking:
•  The exhaust gas temperature (EGT) is typically defined as the gas temperature at the exit of the turbine
https://www.researchgate.net/publication/266673900_A_Review_of_Exhaust_Gas_Temperature_Sensing_Techniques_for_Modern_Turbine_Engine_Controls#:~:text=The%20exhaust%20gas%20temperature%20%28EGT%29%20is%20typically%20defined,parameter%20for%20optimizing%20fuel%20economy%2C%20diagnosis%2C%20and%20prognosis.

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