The axes and symbols are plotted as in figure 3. (a) Hα and Hβ light curves of YZ CMi on January 18. (b) TESS light-curve of YZ CMi during the OISTER observations on January 18. (c) Hα and Hβ light curves of flare C. (d) Same as panel (c) but for the flare component’s continuum luminosity in the TESS band. (Color online)