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  • Relative density (RD) scores reflect the average density of a species within a given BCR relative to density in the single BCR in which the species occurs in its highest density. RD is one of two area importance measures used in the PIF assessment process. Because the score is one of relative density, it is unaffected by the size of the BCR or the absolute density of the species. One use of RD scores is to filter out species that do not occur in a planning region (see PIF Handbook on Species Assessment, Part II). Therefore, for species that are being, or have been, extirpated from a region, the RD score is based on an estimate of historic density to ensure they are not overlooked in conservation planning.