Comment (by Roland Haas):

Documentation and command line options for overriding f0, M_ADM, M_final and a_final were added in git hash a39f1e8 "power: fix typo in docs" of Gravitational_Waveform_Extractor

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2413/include-power-code-to-extrapolate