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Matt,
Great images, your solar full disc images are getting better and better.
Have a safe trip.
Fernando
PS: Synthetic flat is a flat frame that you extract from the image containing the gradient you want to fix. Normally the synthetic flat is generated applying Median Filters with a high pixel area. The result is a blurred version of the original image but with the gradient embedded. This frame is then subtracted from the original image with some adjust in the opacity. The final image will have a uniform luminance level.
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