Hi there,
There only appears to be one file in the dropbox, and although the name suggests it's the master dark, the fits header implies its actually the bias (0.001s exposure) so it's a bit hard to work out what's going on.
Would you be able to upload a dark and a bias frame taken using Artemis Capture? Or if you'd prefer, you can always send them directly to
support@atik-cameras.com to have a look over.
Thanks,
Jo