Left panels: combined mid (100−196 MHz) and high (200−340 MHz) dynamic spectra obtained by BIR CALLISTO receivers covering the high-frequency range of the type II event detected on 2014 October 30. Darker-colored lines show the time intervals over which the NRH data have been averaged at a given frequency. Right panels: locations of the centroids of 2D elliptical Gaussian fits (shown with 95% contour levels) to the type II sources observed by NRH (plotted with colors corresponding to the frequencies in the left panels). Dashed circles correspond to the corresponding EUV front locations.