$opertemp

$opertemp is the reference temperature in the program. Usually it is set as Ambient temperature

Example

$opertemp
300.0

This means the reference temperature is 300K.

The $opertemp setting for 1D-DDCC in GUI interface

The $opertemp setting for 2D-DDCC in GUI interface
Press Contact Setting and fill in the field for the Temperature(K)!