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RegiStar can also be used to make identically sized images with exactly the same content by setting the reference image weight to .0001 (right click on the image after registering and then type in .0001) and then average combining.
These images can then be split into RGB if OSC and then you can combine your HA and O3 into each color channel along with the RGB.
I also use this to make identical aligned images differing only in exposure for EasyHDR.
If stacking noisy images tick the either of the noise settings because RegiStar is also very good at stacking noise.
Registar is also great for mosaics.
There are more tricks. I could not process without it.
Bert
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