Stellar number density distributions on the effective temperature and metallicity planes. The left panel displays the relation between the estimated metallicity and T_eff (black symbols) and their corresponding polynomial fit (red solid line) for the LAMOST-MRS young stellar sample. The black symbol represents the mean estimated metallicity and T_eff in each T_eff bin with a ΔT_eff of 100 K. The dashed red lines represent the corresponding standard deviations of the metallicity in each T_eff bin. Additionally, the stellar number density distribution on the T_eff-[M/H] plane is plotted in the left panel. The right panel shows the stellar number density distribution on the T_eff-[M/H]_corr plane. The solid and dashed red lines represent the mean corrected metallicity values and the corresponding standard deviations of the metallicity in each T_eff bin, respectively.