All detected injections with their injected S/Ns plotted against their recovered S/Ns by HEIMDALL. Marker sizes indicate HEIMDALL’s reported width of the injections and the colours show the scattering times with which they are injected referenced to 1 GHz. The vertical lines display a rise or drop in S/N between an SP’s discrete injected S/N and the recovered HEIMDALL S/N. 109 injections (red numbers in inset) with a discrete injected S/N below the set S/N threshold of 6.5 (dashed red lines) were unexpectedly detected due to one of the reasons listed in Sect. 3.2.3.