Molecular Bands

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Robin Leadbeater

Yep assuming that blue is on the right, that central band looks just like a molecular band with a steep band head on the red side tapering down towards the blue.  Like C2 Swan bands in comets for example. (hydrocarbons from left over fuel?) If you are using coated lenses then the cut off will be around 3650A. Do you have a best guess wavelength calibrated spectrum to share?