The authors have been conscientious in responding to all reviewers, making changes where necessary. All referees were supportive of the manuscript, and the referee with the most comprehensive and detailed list of comments is now very happy with the result, asking for the technical questions as detailed below -- which can be considered technical corrections. Once the authors address these very minor issues the paper is fit for publication.

1) On p. 5 of the pdf version, line 26, in the definition of the reduced specific intensity:
change "I = I’/n" to "I = I’/n^2" , (i.e. replace n by n-square).

2) On p. 6, first line: change „Planck" to „Boltzmann“ .
Note that the Planck constant does not appear in the classical Rayleigh-Jeans formula!

3) On p. 7, line 4: change „materials permittivity formulations“ to „material-permittivity formulations“
Note that adjectives do not have a plural form in English.

4) Figure 5 was extended to 4 square plots. This is fine. However the plots are too small and should be increased to a size that allows proper reading of everything.