Heliosheath filtering function, Eq. (9), in relation to the particle size, for the same time periods as Fig. 11, for the union subset with measurement-derived masses (panel a), for the Strub subset with measurement-derived masses (panel b), and for the union subset with iteratively calculated masses (panel c). The vertical error bars correspond to the (assumed) Poissonian standard deviation of the number of particles within the respective size and time bin (cf. Appendix D.5), (see Hunziker et al., in prep.).