ISD distributions from Ulysses data (stars) between 1992 and 2008 and the (extrapolated) MRN distributions for a hydrogen density of 0.1, 0.2, and 0.3 cm-3 (dashed, dotted, and continuous lines) adapted from Mathis et al. (1977). The left plot shows the number density, the middle plot the mass number density, and the right plot the cross section number density. The cut-off for silicate grains in the MRN-distribution is indicated with a vertical dashed line at 0.25 μm (1.3 × 10-16 kg) and for carbon grains at 1 μm (8.4 × 10-15 kg).
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