Comparison of two stars with similar large separations, one belonging to the RGB (KIC 4750456, Δν = 5.89   μHz, blue curve) and the other to the secondary clump (KIC 3758458, Δν = 5.87   μHz, red curve). The x-axis is the reduced frequency n′; vertical lines indicate radial modes. The dashed curves represent 20 times the smoothed spectra; the regions corresponding to the FWHM are overplotted with solid lines.