↩ 🔵 🔵 🔵 ❪✺❫ Spectral Fitting Concepts ○ ❪✺₄❫ High-Energy Astrophysics Sets ○ ❪✺₄❫ Spectroscopic Sets ○ ❪✺_ₛₛ❫ Spectral Fitting Subsets ○ ❪◔❫ Spectral Fitting Models ○