 A steep gradient indicates low evenness as the high-ranking species have much higher abundances than the low-ranking species.A shallow gradient indicates high evenness as the abundances of different species are similar.Quantitative comparison of rank abundance curves of different communities can be done using RADanalysis package in R. This package uses the max rank normalization method in which a rank abundance distribution is made by normalization of rank abundance curves of communities to the same number of ranks and then normalize the relative abundances to one.