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I have been finding significant RBI on my spectroscopy images using both a ST8XME and a ST9E. If I take a spectrum of the neon reference and then take a data spectrum, the neon lines are clearly visible in the spectrum of the star. this is despite the neon lines only reaching levels of about 2000. To get around this I take my star images first, then the neon lines then take flats with a halogen light. The flats will have levels around 20000 and this swamps the neon lines. If I then tahe more data images the raised background form the flat is very obvious for about 15 mins but this shouldn't affect the spectrum.
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