a) Narrow band of LS emission at a frequency slightly below 16.5 MHz, together with complex QS and MS bursts in the band ~14−24 MHz. b) Zoom of the apparent NB emission (inside the rectangle shown in a)) revealing LS emission. The LS structures characterized by a slow frequency drift are occasionally crossed by faster drifting QS bursts. Resolution: 1 pixel = 20 kHz × 2 ms a), and 1 kHz × 0.5 ms b). Blue and yellow segments illustrate drift rates.