↩ 🔵 🔵 🔵 ❪✺_ₛₛ❫ Electromagnetic Subsets ○ ❪✺_ₜₛ❫ Physical Typesets ○ ❪✺_ₜₛ❫ Polarimetric Typesets ○ ❪✺_ₜₛ❫ Spectroscopic Typesets ○