Diameters of the equivalent spheres of water ice representing the volatile content of the particle as a function of the cometocentric distance at the time of detection. Diameters are calculated with Eq. (1). Panel a: all icy particles detected over the course of the entire mission (August 2014 to September 2016). Panels b and c: icy particles detected at heliocentric distances between 3.0 au and 3.6 au during the inbound trajectory and the outbound trajectory, respectively.