With that colour mix, the jet is mostly red/purple as it is dominated by the various molecular hydrogen emission lines, energised by shocks in the outflowing material. There is also some CO emission in the flow & colour differences arise due to different excitation & dust extinction conditions, especially near the centre where there is lots of dust around the central protostar.
The diffuse green emission is due to polycyclic aromatic hydrocarbon emission associated with tenuous dust.
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