You input a temperature in the FMS (ATIS info). For T/O thrust this is the number used. We used an assumed temperature for a flex takeoff.

After the aircraft is airborne, it uses the probes to detect temperature/conditions to set a thrust limit.

Fedex Method: We check this power setting by using a laptop computer. We input ATIS information into the computer. The FO reads the information on the laptop, the Captain verifies that the numbers match. Some numbers vary, such as V1, in this case the laptop computer V1 speed is edited in the FMS.

So your answer is the temperature loaded into the FMS. Again, this is only for takeoff thrust.