jMol series twin planes

Here's a spherical silicon nanosphere with a single {111} twin plane which terminates according to Danielle's model. The twin end is marked, but the twin is not. Can you see where it's at? How many atoms are in the twin, out of the 700 atoms in the model as a whole?
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Version of this model that supports transparency

Below to the left find a comparison between an experimental high-res electron microscope image (top: green) of a "nanotwin end" in germanium, and a simulated image (bottom: grey) of the jmol model above. Any ideas how to explain the difference?

Here is a darkfield image of a pair of <111> nanotwins found in gigascale integrated circuit silicon as manufacturers were working to scale up to the routine production of 12 inch diameter wafers.

Below find comparison between that experimental Ge image and a physical model put together by Danielle K for a Science Fair project.