ODF opacity against the temperature of the four stellar atmospheres (different colour lines, corresponding to a different spectral type as in Fig. 1), and for 12 substeps (different panels) of the ODF step defined by the λ ∈ [590, 600] nm range: SYNPEC (thick coloured lines) and ATLAS (thin black lines). The number at the left bottom corner of each panel indicates the substep in the order of increasing opacities. This ODF step is an example of a generally good match between SYNPEC and ATLAS that is found in the majority of ODF steps in the visible and IR. The only systematic difference is present in all substeps at the top part of the M model.