Peak flux of neutral helium observed by IBEX on orbits 54 through 68 during the 2010 observation season (dark blue symbols with error bars), compared with the modeled peaks (orange) for the NIS He gas population for the flow parameters found by Bzowski et al. (2012). Both observed and model values are scaled to the respective values for orbit 64, when the season maximum flux was observed. The lower axis presents IBEX orbit numbers, and the upper axis presents the corresponding ecliptic longitudes of Earth.