The left model shows a cluster of atoms only a few unit-cells across. The field width of the initial 300 pixel wide view is about 29 Ångstroms (or 2.9 nanometers).

A "flat Ewald slice" (kinematic electron diffraction pattern) of the corresponding reciprocal lattice is on the right. Assume that the half-width of the initial view there corresponds to a Nyquist spatial frequency of g = 0.86 cycles per Ångstrom (or 8.6 cycles per nm). Hence a diffraction spot centered on the right edge would correspond to vertical lattice fringes of spacing or periodicity d = 1/g ~ 1.16 Å (or 0.116 nm).

*Challenge*: By reorienting the specimen with the microscope
controls below the display, try: (i) determining the lattice parameters
(a, b, c, &alpha, β γ) for this crystal in terms of its
standard basis triplet, and/or (ii) capturing a
<110> zone diffraction pattern & indexing the spots in it. How
many such zones are there? Here
are calculators that might come in handy for the
left and
right sides of the figure.