UDF for DOM recalling non-gray radiative heat flux
 

hello everyone, i've gotten a big problem in UDF for a long time.
if someone could help me out of the situation i would very appreciate.

here is my question, i'd like to use DEFINE_HEAT FLUX recalling the radiative wall heat flux for the non-gray band, which for the short wavelength part.

how can i define the only short wavelength part?