Radio signatures of shock-accelerated electrons associated with a fast-expanding CME. (a) Dynamic spectrum from the e-Callisto Birr and ORFEES spectrometers, showing multiple lanes of emission over a wide frequency range consisting of herringbone-radio bursts. (b) Early evolution of the CME shown in EUV images from SDO/AIA in the 211 Å wavelength together with contours of the radio sources at four frequencies: 150, 173, 228, and 327 MHz. c. Evolution of the CME in the outer corona as observed in combined SDO/AIA and white-light images from SOHO/LASCO. A shock is visible as a faint outer boundary in the white-light images.