The image depicts a schematic diagram divided into 2 sections, A and B. Section A depicts intra-aggregate pores, indicated by circular markers and annotations, approximately 0.1 micrometres in size. Section B depicts inter-aggregate pores, with directional arrows highlighting their arrangement within larger structures. Solid black lines depict the aggregates, emphasising the pore structures within and between them. The layout allows visual comparison between the 2 pore types. Each section is clearly labelled, aiding understanding of the spatial relationships of these features.Schematics of (a) the intra-aggregate pores resulting from the irregular packing of aggregates with approximately 0.1 μm width between single particles of soil and (b) the inter-aggregate pores are formed by the stacked aggregates (modified from Yu et al., 2016)