Conductivities and resistivities at different stages during the collapse (Hall resistivity : dotted line for the negative values and solid line for the positive ones). Comparison between the MRN non-evolving (PC0), the coagulation only (PC1), and the coagulation-fragmentaion (PC1 − FRAG) dust models. Last column: Electrons (solid) and ions (dashed) density (top), and peak size of the dust distribution (bottom).