LAMOST DR10 low-resolution and medium-resolution samples in the ET 2.0 field, presented in the three panels above and the three panels below, respectively. The left, middle, and right panels of each set of images represent the relationship diagrams of different physical parameters. Left panel: HRD based on Gaia DR3 data. The color bar indicates the number density of stars. Middle panel: The relationship diagram between (T_eff) and log 𝑔 based on LAMOST DR10 data, with the color bar representing the parameter [Fe/H]. The black dashed line represents the empirical formula proposed by Ciardi et al. (2011). Dividing the samples into giant stars (above the line) and main-sequence stars (below the line). Right panel: relationship diagram between (T_eff) and log g based on LAMOST DR10 data, with the color bar indicating the number density of stars.