For more details please see the referenced text, and note that more up to date radiative phase functions should be used.
An adaption of the Enthalpy-Based Thermal Evolution of Loops (EBTEL) model (Klimchuk et al. 2008, ApJ, 682:1351-1362; Cargill et al. 2012A, ApJ, 752:161; Cargill et al. 2012B, ApJ, 758:5) will be scripted in the future.