If an election has been made with respect to such former spouse under section 4159 or 4046(f) of this title, then the survivor annuity under subsection (a) of such former spouse shall be equal to the full amount of the participant’s or former participant’s annuity referred to in subsection (a) less the amount of such election.
Nothing in this section shall be construed to impair, reduce, or otherwise affect the annuity or the entitlement to an annuity of a participant or former participant under this subchapter.