Peak intensities as a function of longitudinal separation angle. Positive separation angles denote a source to the west, negative angles mark a source to the east of the spacecraft magnetic footpoint. Observations of the same event are marked by the same color. Points lying on the horizontal axis denote that there were no observations because of various reasons (cf. Tables 2 and 3). The curves represent Gaussian fits (Eq. (1)) for the three-spacecraft events.