For Relative Thermal Conductivity, the two solvers EJ and LIR are available and can be chosen from the pull-down menu. The solver settings are similar to those available in the ConductoDict module, so please refer to the description in the ConductoDict handbook for details. Note, that in ConductoDict more options are available, that cannot be selected in the Relative Thermal Conductivity options dialog (e.g. no restart options are available here).