Dirty maps in natural weights of the residual Band 7 visibilities, after subtraction of the disc. The grey scale stretches over the full intensity scale, and for each of seven epochs. The inset zooms into PDS 70c, with contours at 90 and 120 μJy beam⁻¹, fixed for ease of comparison across epochs. As in Fig. 1, the circles are centred on PDS 70b and d, and are drawn here to ease the search for any variable counterparts.