Effects of the flaring region size on particle and photon spectra of a nonthermal flare. Top panel: Electron distribution N_e(γ) multiplied by γ at t = 10 t_acc for different radii and magnetic field strengths of the flaring region (see inset legend) and the same electron compactness ℓ_e (see Table 1). For R = 0.1 R_S we also show results for 5ℓ_e (dashed line) and 25ℓ_e. Bottom panel: SSC spectra produced by the electron distributions shown on the left panel.