Scatter plots showing average rim curvature of 3–15 km diameter craters as a function of latitude for the lunar (a) north and (b) south polar regions. Gray circles represent individual craters, while colored squares denote mean curvature values at 3° latitude intervals. The solid colored lines illustrate the trend in mean rim curvature with latitude, and the dashed horizontal line serves as a reference. The error bars represent the standard error in mean values.