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The correlation between CRSED and some other indexes. (a) The scatter plot of CRSED versus I. (b) The scatter plot of CRSED versus S/N. (c) The scatter plot of CRSED versus H1, H2, and H10. The red triangles represent the high rarity level of surname H1, the green squares represent the median rarity level H2, and the blue circles represent the low rarity level H10. CRSED, coverage ratio of stretched exponential distribution
