The files in this folder are the raw HAADF images, Spectrum Images and EELS spectra used to produce Figures 3a-i. Note that, due to the cumbersome and specialised nature of the data, these are best visualised using the free offline version of Gatan Microscopy Suite 3 (i.e. GMS3) incorporating the EELS/EFTEM Suite. This is free to download at https://www.gatan.com/enabling-researcher-access-gms-3-during-covid-19-lab-closures (accessed 28-7-21). Structures (in protein database *.pdb format) can be visualised using freeware or open source utilities such as Molmil (http://gjbekker.github.io/molmil/) or Rasmol (http://www.openrasmol.org)