↩ 🔵 🔵 🔵 ❪✺₄❫ Spectroscopic Sets ○ ❪✺_❫ Spectroscopic Subs ○ ❪✺_ₛₛ❫ Electromagnetic Subsets ○ ❪✺_ₛₛ❫ Spectral Fitting Subsets ○ ❪✺_ₜₛ❫ Spectroscopic Typesets ○