Lepton DFs for ﹩\mu =10^{-7}﹩. The ﹩B_{*}=10^{12}﹩ and ﹩10^{13}﹩ G DFs are shown for cosine complement ﹩\mu =10^{-7}﹩ and two values of seed photon energy. A characteristic double‐humped shape is evident and is due to unequal splitting of parent photon energy to the lepton pair. The much more narrow DFs in the ﹩10^{13}﹩ G case give the much larger K values seen in Fig. 5. Vertical offsets have been made for clarity.