These "horizon" faces are very specific, in the way that they are not meant to be coupled to conduction. "Emissivity" can be derived from albedo, and "Temperature" corresponds to an estimation of the temperature of these faces.
Warning : Even if it has been coded and tested by the two authors, so that it should normally work properly, one has to mention that the feedback on this specific feature is still not very large, so for complex cases, problems may arise. In that case please contact SYRTHES support.