↩ 🔵 🔵 🔵 ❪∂₌❫ High-Energy Astrophysics Formulations ○ Chi-Squared (χ²) ○◂ᴴᴱᴬ Channel Error (σ₍I₎) ○◂ Observed Counts (C₍I₎) ○◂ Predicted Counts (Cₚ₍I₎) ○◂