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Mike, I use the resample option in ninox (used to be ppmcentre) before I run registax. Registax does not support resampling of fits files :-(
Each channel is 50 seconds, and I had to compromise the stack slightly by offsetting the red channel 1 pixel to get Io close. It's still not quite right, the offset should be 2 pixels, but it looks ok. It's not a composite.
cheers, Bird
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