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Detail of one of the thrust cells at the top of the west nozzle ramp.

The foil-clad tube is a fuel (hydrogen) supply line, entering the thrust cell to provide regenerative cooling to the combustion chamber walls (the nozzle ramp is also regeneratively-cooled by part of the fuel before being routed to the thrust cells).

The bare, silver line entering the top of the thrust cell is the LOX line.