Comparison of the residual temperature distribution of the S⁴N literature temperatures (see bottom left panel of Fig. 16) with the ones in common with Kovtyukh et al. (2003, red points). Vertical red lines connect points sharing the same spectrum and therefore ATHOS output. The red dashed line corresponds to the mean difference of 14 K when using the Kovtyukh et al. (2003) reference and the solid red lines indicate the ±1σ scatter of 81 K.