| http://www.w3.org/ns/prov#value | - a gas distributor in the reaction chamber, the gas distributor having a plenum through which a gas can flow along a flow path, the plenum having a distributor plate transverse to the flow path, and the distributor plate having a plurality of passageways extending through the plate, the passageways including first passageways having a first physical parameter and extending through the plate at an o
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