The imaginary part of each zero is recorded with an absolute precision of $\pm 2^{−102}$ and the completeness of the list was checked using a rigorous version of Turing's method; see [MR:3315519, 10.1090/S0025-5718-2014-02884-6] for further details.
The results have been checked to a separate list of zeros independently computed by Jan Büthe to an accuracy of $\pm 2^{-64}$ (this comparison found 108 minor discrepancies, each of which was resolved in favor of the data presented here).