Stellar distributions on the plane of ∆ν–∆P derived using our neural network method for 1800 training (left panel) and 862 testing stars (right panel). The black, red, and blue dots show the 826 RGBs, 1599 primary RCs, and 237 secondary RCs classified by Vrard et al. (2016) using Kepler data, respectively. The blue dashed line (∆P = 150 s) is plotted to separate RGBs and RCs. The black dashed line (∆ν = 5µHz) is plotted to separate primary RCs and secondary RCs.