↩ 🔵 🔵 🔵 ❪✺❫ Spectral Fitting Concepts ○ ❪✺_❫ High-Energy Astrophysics Subs ○ ❪✺_❫ Spectroscopic Subs ○ ❪✺_ₛₛ❫ Spectral Fitting Subsets ○