↩ 🔵 🔵 🔵 ❪✺❫ High-Energy Astrophysics Concepts ○ ❪✺₁❫ Astronomical Classes ○ ❪𖣐₁․❫ Classes of High-Energy Astrophysics Data ○️ Event ○꠹ᴴᴱᴬ Hardness-Intensity Diagram (HID) ○꠹ Response Matrix ○꠹ X-Ray Binary (XRB) ○꠹