Bolometric radiative energy exchange rate Q^ODF against the geometrical height in the four stellar models. The results using ODF from SYNSPEC (coloured lines) are compared to those using the ODF from ATLAS (thin black line). Top left of each panel: scaling factor of vertical axis. Bottom left of each panel: difference between the two ODFs computed using Eqs. (13) and (14). Top right of each panel: ratio of the heating area with respect to the cooling area for the Q for both data sets (A for ATLAS and S for SYNSPEC). In cyan in the bottom right panel for the M2V star: ODF computed using monochromatic opacity from SYNSPEC, excluding the lines from TiO and VO. The corresponding deviations for that Q curve are χ_C ≃ 7 and χ_Η ≃ 29.