Electron omnidirectional differential fluxes and electron PA distribution during the interval 18:16:00–18:21:00 UT. (a) Omnidirectional differential fluxes of the 3–4627 eV electrons. (b)–(d) PA distributions of suprathermal electrons in the energy range of 15–35 eV, 39–55 eV, and 62–1000 eV, respectively. The vertical dashed blue line indicates the transmitted IP shock. The two vertical dashed black lines mark the discontinuity-like structure interval.