↩ 🔵 🔵 🔵 ❪✺❫ Spectral Fitting Concepts ○ ❪∂❫ High-Energy Astrophysics Math ○ ❪∂❫ Spectroscopy Math ○ Spectral Fitting ○𓆪 ❪𝛿❫ Spectral Fitting Quantities ○