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Darrell,
Sorry I missed this post...
As mentioned you need better exposures and double check the focusing on the spectrum, not the zero order star image (this will end up slightly out of focus)
The shape of the spectrum shows the typical "fishtail" associated with non apo telescopes....getting the UV into focus at the same time as the red is impossible with achromats. You can take separate images re-focused for the different regions to overcome this.
The book missing from your collection is "Grating Spectroscopes - How to use them" available thru Amazon/ Springer ;-)
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