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Overall view of the #3 TD-339 vernier engine installed by the #3 landing leg.

Picture 2 of 2.

Note the high-pressure helium tank (at top; spherical, with white top and black band) and the vernier fuel (center; with silver foil covering) and oxidizer tanks.

Vernier #3 was a fixed engine; note the straight-forward arrangement of the propellant supply lines (silver lines above the engine, terminating at the engine's back left).