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Chris,
The thicker dark line across the image is the Ha absorption line. This is where I would extract the imaging data, any bandwidth from 0.2A upwards.
As each frame of the AVI (usually 2000 frames) forms part of the reconstructed image correction is almost impossible. No one as yet has come up with a way of applying flats to an AVI.
For more conventional AP imaging, this result also infers that the sensitivity of the chip will not only vary with the QE curve but also with the added ripple!
(The vertical lines are due to inconsistencies in the entrance slit gap and can be easily removed with synthetic flats applied to the final image)
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