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That's an impressive spectrum Ken.
It will be my next step to make the transition to higher resolution spectroscopy.
Registax was only used to combine two separately PixInsight stacked images of 3C-273 spectra collected over different nights.
For what ever reason, there is not much latitude for alignment errors when aligning and stacking spectra when compared to deep sky images.
For Gamma Velorum keeping the alignment error to a minimum and tweaking the settings in PixInsight there was no need for Registax for stacking spectra images.
Since dithering was used, autoguiding was necessary to control the dithering.
The maximum alignment error in this case was 4 pixels which PixInsight was able to handle.
Steven
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