Distributions of number density (left panel) and metallicity (right panel) for one million SMSS DR4 stars in the T_eff - log g planes. Both panels are computed using bins of 25 K in T_eff and 0.04 dex in log g, with color bars above each panel indicating the corresponding values. Number densities are shown on a logarithmic scale, while metallicities are represented by the median values within the bins. The lower limit of the right color bar is set to −2, so all metallicity values below −2 are shown in the same color as −2.