↩ 🔵 🔵 🔵 ❪∂₁❫ High-Energy Astrophysics Functions ○ Observed Counts (C₍I₎=∫f₍E₎⋅R₍I,E₎⋅dE) ○￩ Instrument Channel (I) ○◂ Photon Energy (E) ○◂