Fig. 3: Charge distribution single particles and two-particle clusters.

Histograms of the measured charge distribution of singlets (blue) and doublets (green) together with their mean positive charge. The singlet and doublet distributions consist of 761 and 611 particles respectively, of which 4 singlets and 42 doublets have a charge outside the axis limits, within the range (−66 − 84)e. Although not plotted here, these data points are included in further analysis. The average singlet charge Qs and the average doublet charge Qd are indicated in the legend.