A0_PE_factor
Developer documentation: this item describes internal implementation details.
Discussion
These coefficients multiply \(A_0^2\) to give a horizontally-averaged depth-integrated potential energy for the geostrophic solutions.
Assuming hydrostatic modes, this is
\[PE = \frac{g}{2}\]for the \(j>0\) modes and
\[PE = 0\]for the \(j=0\) barotropic mode.