Distributions of 3220 RGBs (left panels) and 3276 RCs common to LAMOST and Kepler (right panels) on the M–∆M/M plane. M and ∆M are the estimated masses and their associated uncertainties. The red dot presents the median values in each mass bin with a bin size of 0.1 M_⊙. Green dots are stars with M < 0.7 M_⊙. Blue stars show the post-mass-transfer helium-burning stars identified by Li et al. (2022b). Distributions of masses and their associated uncertainties are over-plotted using histograms.