**Authors contributions**

EMS drafted the manuscript (ms), PW performed STEM microscopy, 3D tomography and reconstruction, PS performed experiments, designed figures and contributed to the ms text; BM performed experiments and drafted the ms, MH, and PSch contributed to chemical property analysis of Vac, HM contributed to trans electron microscopy, AP, CRW, and MG edited the ms. All authors reviewed and approved the final version of the ms.
