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In VASP, the symmetry is determined from the POSCAR file. In VASP.4.4, the accuracy to which the positions must be correctly specified in the POSCAR can be customised only during compile time using the variable MY_TINY. Per default MY_TINY is 10$ ^-6$ implying that the positions must be correct to within around 7 digits. If positions are not entered with the required accuracy VASP will be unable to determine the symmetry group of the basis.

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