Left: spectral energy distribution for all stars (see text). The black body curve is only included for guidance. Right: all available individual MIDI spectra around the visual maxima for all stars (including an average of these) except for R Hya were the spectra around the visual minima are given. The visual light phases are given in brackets. Note that due to the telluric ozone feature the uncertainties at around 9.6 μm are increased. The corresponding plots for W Hya can be found in Paper I (Fig. 5).