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On the other hand, it is also known that slight modifications of the Hammersley point set can lead to the optimal order $\\sqrt{\\log N}/N$ of $L_2$-discrepancy, where $N$ is the number of points. Among these are for example digit shifts or the symmetrization. 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On the other hand, it is also known that slight modifications of the Hammersley point set can lead to the optimal order $\\sqrt{\\log N}/N$ of $L_2$-discrepancy, where $N$ is the number of points. Among these are for example digit shifts or the symmetrization. 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