Coverage of the (u, v)-plane obtained from the VLTI/MATISSE observations of 3 Puppis. The legend in the lower-right corner indicates the colours corresponding to the four AT configurations used: small (blue), medium (orange), large (green), and extended (red). A schematic map of the VLTI baselines, using the same colour code, is shown in the upper-right corner. East corresponds to increasing x-axis values, and north to increasing y-axis values.