Dynamic spectra of (a) harmonic band of type II burst observed with HBA of LOFAR on August 25, 2014; (b) F-H of type II bursts observed with LBA of LOFAR on October 16, 2015 (A) (the upper part of the spectra (HBA) is not shown here); (c) same as (b), but for October 16, 2015 (B) event. The arrow shows the F-H bands of these type II bursts. The white and cyan marks are the time frequency at which interferometric radio imaging was carried out and are shown in subsequent figures in this article. The imaging time and frequency were chosen in such a way to cover both fundamental and harmonic bands of type II bursts (if available).