Depth-to-diameter ratio distribution of lunar polar craters with respect to latitude for the (a) south and (b) north poles. Individual craters are shown as faint points. Filled circles represent mean d/D values calculated in 3° latitude bins in this study, while open diamonds denote mean values reported by L. Rubanenko et al. (2019). Dashed horizontal lines indicate reference d/D values based on the mean at ∼62°N/S latitude. The error bars represent standard error in mean values.