Directional dependence of the model hydrogen and helium ENA flux (solid line) compared with the HSTOF 1996−2005 data for four ecliptic longitude sectors (boxes). The HSTOF data correspond to the lowest energy bins (58−68 keV for hydrogen, 28−38 keV/n for helium). The height of the boxes is the same as the height of the error bars in Figs. 1, 2 (the lowest energy data points for 1996−2005). The model ENA flux is averaged over similar energy intervals (58−66 keV for H, 28−34 keV for He) and scaled down by the factors 1/4.5 (H) and 1/2.5 (He). The averages of the model flux over the ecliptic longitude sectors are shown by dashed lines.