Retrieved number density of free-flying aggregates in the three cells of the SPACE experiment. The size distributions of large aggregates composed of polydisperse and monodisperse dust are shown as black solid and green dashed curves, respectively. The size distribution of small aggregates composed of monodisperse dust is shown as the red dash-dotted curve. The origin of time is at the start of data recording. The shaking cycles are indicated by dashed lines.