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Empirical distributions of A = Σi Ai over the entire ChemDB, and over the set of ChemDB queries received over the Web during a period of four consecutive months, using fingerprints of length N = 512. The distribution of A across the entire database is well modeled using a Gaussian distribution with mean 119.53 and standard deviation 40.07. In contrast, the mean and standard deviation of the received queries are 64.09 and 45.88 respectively.
