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Another way that might work for you is to:
1. Open all RGB images individually.
2. Select and copy green image. CTRL A, CTRL C
3. Select red image and paste green over the top. CTRL V
4. Do the same for the blue image.
You should now have a single image containing the tree layers.
5. From the menu-bar, select EDIT - Auto-align layers.
(I flying from memory but I think I have it right)
Hope that helps.
Robert
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