- ❪✺❫ HEASoft Concepts ○
- ❪✺❫ Spectral Fitting Concepts ○
- ❪✺₁❫ High-Energy Astrophysics Classes ○
- ❪✺₂❫ High-Energy Astrophysics Domains ○
- ❪✺₃❫ High-Energy Astrophysics Particulars ○
- ❪✺₄❫ High-Energy Astrophysics Sets ○
- ❪✺_❫ High-Energy Astrophysics Subs ○
- Event Grade ○
- Pileup ○
- Quasi-Periodic Oscillation (QPO) ○