Colour–magnitude diagram containing objects in Baade’s window, the bolometric magnitudes were computed from 2MASS photometry by using the BC_K given in Montegriffo et al. (1998). The labels at the top denote effective temperatures and spectral types of late-type giants for a given calibrated colour as listed by Houdashelt et al. (2000, their Table 4). Overplotted are the corresponding data for the galactic C-type Miras of Whitelock et al. (2006) adopted from their Table 6, as well as the results for all atmospheric models investigated here. The vertical dashed line at (J – K) = 1.6 marks approximately the border between the hydrostatic and the dynamic regime for C stars (as discussed in the text).