Central fractional abundances of species. Top left: Model 1, agr = 0.019 μm, middle left: Model 2, agr = 0.038 μm, bottom left: Model 3, agr = 0.075 μm. The convergence of the abundances of positively- and negatively-charged grains is pushed to higher densities with increasing grain radius. The departure of the electron abundance from the ion abundance also happens at higher densities with decreasing grain surface area. The dashed vertical line at nc ≈ 106 cm-3 indicates the density at which the chemistry and non-ideal MHD treatment are switched on, while the one at nc ≈ 3 × 1018 cm-3 shows when we assume the destruction of grains restores flux-freezing. Top right: Model 4, agr = 0.113 μm, bottom right: Model 5, agr = 0.150 μm. Since the grain radius increases only by a factor of 4/3 from Model 4, the effect on the abundances is less pronounced than it was for the smaller grains.
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