↩ 🔵 🔵 🔵 ❪𝛿’❫ Spectral Fitting Statistics ○️ Chi-Squared (χ²) ○◂ Chi-Squared (χ²=Σ₍C₍I₎-Cₚ₍I₎₎²∕σ₍I₎²) ○￩ᴴᴱᴬ