Fig. 4: Elevated oblique 3-D views of tesserae flooded by mafic lavas.

Images were generated from SAR images draped on the Magellan altimetry topography using the software ArcScene (vertical exaggeration 20×). These images correspond to the areas shown in Fig. 3: a corresponds to area of Fig. 3b viewed from east (red box explained in Figs. 3b and 5 and discussed in text); b Fig. 3c viewed from south (white box gives approximate location of Fig. 3c); c Fig. 3c viewed from east (white box gives approximate location of Fig. 3c); d Fig. 3d viewed from south-southwest; e Fig. 3e viewed from south-southeast; f Fig. 3f viewed from east; g Fig. 3f viewed from southwest; white strike-and-dip symbols denote potential geological bedding (flood basalt sequence?) dipping to the east; h Fig. 3g viewed from west, and i Fig. 3h viewed from south. White boxes in b and c give approximate location of Fig. 3c. All surfaces viewed from an elevation angle of about 20°. False horizon at top of images due to limited extent of data clipped for processing in ArcScene. Additional versions of b–g were derived through draping the SAR image on the stereo-topography of Herrick et al.³¹ and are available in Supplementary Information. The images in Supplementary Fig. 1 do not appear to provide any better resolution than corresponding ones in Fig. 4.