A temperature profile input file must consist of two lines:

the first line must begin with time and should be followed by space-separated real scalars, giving the times (in s after the start of the simulation) of the temperature set points — the times must be in increasing order
the second line must begin with temp and should be followed by space-separated real scalars, giving the temperatures (in K) at the corresponding times

The temperature profile is linearly interpolated between the specified times, while before the first time it takes the first temperature value and after the last time it takes the last temperature value.

Example:

 time  0    600  1800  # time (in s) after simulation start
 temp  270  290  280   # temperature (in K)

Here the temperature starts at 270 K at the start of the simulation, rises to 290 K after 10 min, and then falls again to 280 K at 30 min. Between these times the temperature is linearly interpolated, while after 30 min it is held constant at 280 K.