The code is divided in four separate programs:
- Optabs.f90 - Calculates the RPA current-current response function.
- Sloss.f90 - Calculates the GW self-energy and the screened Coulomb interaction.
- BSE.f90 - Solves the Bethe-Salpeter equation.
- Photon.f90 - Solves the Dyson equation for the photon propagator given a response function.