Theoretical normalised remaining solar wind H+ (dashed lines) and He2+ (solid lines) particle flux ratios with respect to cometocentric distance (2 km to 200 km) along the comet-Sun (x,y = 0,z = 0) axis for several heliocentric distances (forward model). Cometary outgassing velocity was v0 = 700 m s-1, while Q values are taken from Snodgrass et al. (2013) so that Q0 = QS13. At 1.8 AU and in grey, the outgassing velocity v0 was changed from 700 to 400 m s-1. In reality, the used assumption of near-undisturbed solar wind flux tubes breaks down near the nucleus because of mass-loading effects.
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