Caption: Transverse momentum (GeV/c) vs. Feynman x for the kaon production phase space of interest to MiniBooNE. The open black squares show the MiniBooNE beam Monte Carlo prediction for the production phase space of K+ that decay to neutrinos (all types, both 2 and 3 body decays) which are in the MiniBooNE detector acceptance. The remaining symbols show the coverage of past inclusive p Be → K+ X production experiments in the range of interest.