Four out of six available spectra for different chromospheric indicator lines for J07472+503. Left: He I IR line. Right: Hα line. The dashed vertical lines indicate the central wavelength of the displayed chromospheric lines. The same colours indicate spectra corresponding to the same observation date; the corresponding dates are given in Table 4. The emission wing of the blue spectrum is most clearly seen at around 10 831 Å. The green spectrum represents the most inactive state.