Top: S/C constellation in the ecliptic plane, including nominal Parker spiral field lines connecting the S/C with the Sun using measured solar wind speed (see Table 1). The shaded area and two arrows mark the longitudinal sector of the potential particle injection of the 13 March 2023 event. Bottom: Intensities (20 min averages) of ∼25 MeV (top) and ∼8 MeV (bottom) ions or protons observed by Parker (PSP, purple), BepiColombo (yellow), Solar Orbiter (SOLO, blue), STEREO A (red), SOHO/Wind (black), and MAVEN (brown, scaled by a factor of 0.01). The vertical lines denote the times of IP shock crossings at the various S/C (using the same color coding).