Structural description of the rings. Left column: mass-size relation for the different types of ringed galaxies (inner, outer, i+o, and partial rings) with their respective control samples; The solid lines show the median trends for each sample, constructed from a stellar masses binning, while dashed lines enclosed the inter-quartile range of each control distribution. Middle and right columns: Bootstrap mean and standard deviation of the stack, as a function of r₅₀, of the slopes of the radial mass profile and residuals obtained by approximating the slope profile of a ringed galaxy by the median of those of its control group.