Interferometry observation of the type IIIb-III pair. Panel (a1–3) is the interferometric image of the fundamental (type IIIb) part, and Panel (b1–6) shows the second harmonic (type III) part in subband SB008 (26.56 MHz). The radio flux intensity is overlaid on the EUV image observed by SDO/AIA at 12:01:33 UT. The unit of radio flux intensity in this is converted to brightness temperature (Kelvin). The times of snapshots are marked by vertical green or blue lines in the left-top sub-panel of Fig. 3. The peak position of the radio flux intensity is marked by a blue dot with position uncertainty marked as a white error bar in each snapshot. An animation of this figure is available online.