Three or four of the ovals on the chart were empty, something the he told me in a subsequent email he couldn't fill in because they were part of “our proprietary knowledge.” So we don't know, for example, what an apparently key performance factor might be that receives causal input from silane concentration, residence time, fluidization, and temperature, and then effects byproducts and granular silicon yield. If any industry experts can offer any help filling in that blank, please submit a comment!

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