... Data . ... The RELEC experiment was specially developed for study of relativistic electrons in near-Earth space together with TLEs in order to test possible connection between these two phenomena. RELEC mission includes x-ray and gamma-ray spectrometer, 3-axis detector for electrons, UV and red-light flash detector, fast optical imager, low-frequency and radio-frequency analyzers of electromagnetic field and waves. ... Electrons 570-850 keV . ... Gamma-rays 50-420 keV + Electrons 0.2-3.15 MeV . ...