Top panel: temperature stratification in atmospheric models used for non-LTE version of SATIRE-S. The FAL99-C and FAL99-P models (Fontenla et al. 1999) are shown as solid lines and were used to calculate the facular contrast in Eq. (1). The dashed lines show Kurucz solar and stellar models (see U99) used to derive spot contrasts. Bottom panel: comparison of temperature stratifications used in LTE and non-LTE versions of SATIRE-S for calculation of facular contrast. The dashed green curve was derived by modifying the FAL93-P model of Fontenla et al. (1993). The height grids of all models in both panels were offset so that the zero height point in each model corresponds to Rosseland optical depth (calculated in LTE) equal to 2/3. The grey area marks the region of equal temperature difference between quiet Sun and facula in the U99 and FAL99 temperature stratifications (see the Appendix A for discussion).
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