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Thanks Ken and Cam.
I used an ST-10ME (the image was colourized) which has a QE of 50% at 375nm and 60% at 400nm.
The filter is an Astrodon Johnson/Cousins UV photometric filter which (hopefully) shouldn't leak in the IR region.
The image is in fact showing the H-Epsilon emission as per the attachment.
(Note the H-Epsilon line has been incorrectly labelled).
Regards
Steven
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