↩ 🔵 🔵 🔵 ❪𝛿❫ High-Energy Astrophysics Quantities ○ Chi-Squared (χ²=Σ₍C₍I₎-Cₚ₍I₎₎²∕σ₍I₎²) ○￩ᴴᴱᴬ Channel Error (σ₍I₎≈√C₍I₎) ○￩