Photon spectrum dependence on ﹩B_{*}﹩. Seed photon energy ε was ﹩10^{4}﹩, and opening cosine complement μ was ﹩10^{-7}﹩. The high‐energy breaks evident where the high‐﹩B_{*}﹩ DFs steepen are due to pair creation losses. Statistics are poor for the ﹩B_{*}=10^{13}﹩ G DF; at even smaller μ, there are no secondary photons in the strong field. The DFs have been offset vertically.