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I've had another go at this using my genesis CCD rather than the ST9.
The difference is that the ST9 calibrates to ~44 A/pixel and the Genesis/Audine (with 9um pixels) gives me 13.5 A/pixel. This gives better resolution.
The attached file is a graph of Beta Car processed with Vspec.
It is calibrated for instrument response but not for absolute flux.
The spectrum is synthesized from the the spectral data as my original was taken with a mono camera.. The H lines are clearly visible even into the deep purple end.
The absorption from atmospheric O2 and H2O are also clearly visible.
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