Interval (2) of Fig. 2. a) The dynamic spectrum. White lines denote the NRH frequencies. b) 327 (continuous contour) and 410.5 MHz (dash-dot contour) at 09:49:28.8 UT (all normalized as before). The upper source flux dominates, all frequencies coincide, all source sites are slightly displaced with the higher frequency (density) nearer to the flare site. The 432 MHz source flux is below the 20% level.