Representative multiepoch Hα spectra and EW_Hα measurements for eruptive stars with repeated LAMOST observations. Other MS eruptive stars and RS CVn systems are displayed in separate full-width panels to improve readability. For each target, the left panel shows normalized Hα profiles from different LAMOST epochs and the right panel shows the corresponding EW_Hα measurements as a function of relative MJD. The examples provide visual context for the variability statistics in Figures 4 and 5 and are not intended to represent complete activity cycles.