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## G Small Eccentricity Theory

This appendix contains the equations for a theory that is valid for small eccentricities. First-order eccentricity terms are included for the terms that do not have $J2$ as a factor. In the terms that include $J2$ the eccentricity is set to zero, i.e., $e=q1=q2=0$. The $Σ$ and $Σ−1$ matrices do not simplify much by retaining only $O$

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