  We have imaged a freestanding graphene sheet of 210 nm in diameter with 2
Angstrom resolution by combining coherent diffraction and holography with
low-energy electrons. The entire sheet is reconstructed from just a single
diffraction pattern displaying the arrangement of 660.000 individual graphene
unit cells at once. Given the fact that electrons with kinetic energies of the
order of 100 eV do not damage biological molecules, it will now be a matter to
develop methods for depositing individual proteins onto such graphene sheets.
