This specimen consists of small gold islands on a perforated carbon film,
with areas of graphitized carbon. The holes in the film can be used to
provide information on instrument operation similar to the familiar use of
the Fresnel fringe in holey carbon films. The graphitized carbon particles
are best observed where they overlap the holes; they have a characteristic
lattice spacing of 0.34 nm. The gold islands give a coarse measure of
particle to particle resolution, and some of the gold particles will be
suitably oriented to yield a gold lattice image.
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