Particle G, a 1 μm particle scanned with the MIDAS reverse-imaging mode on 8 December 2015 with a resolution of 15 nm per pixel. The smooth, round shape at the bottom with a fading line to the bottom right corner is the tip with which the particle was picked up, above sits the particle with well-visible substructures. Panel a: particle itself. Panel b: larger subunits. Panel c: smallest identifiable features.