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Detail of the bottom of the oxygen coils. The tubes at lower left lead to either the supply or return port (although it seems logical for the LOX to enter at the bottom of the heat exchanger and GOX to exit at the top, I am uncertain as to the direction of the oxygen flow through the heat exchanger).

The helium coils were comprised of two tubes, and I was surprised when I couldn't see the helium pack at the bottom of the heat exchanger.