Upper panel: temperature structure of the best single-component fits for the inactive stars as listed in Table A.1. Model #029 is shown by the red solid line, #042 by the blue dashed line, #047 by the yellow dash-dotted line, #079 by the green crossed line, and #080 by the magenta dotted line. Lower panel: same as in the upper panel for the active stars. Model #131 is plotted by the red solid line and #136 by the blue dashed line. The black solid diamond line shows the VAL C model for the Sun (Vernazza et al. 1981).