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Andrew,
Yeah, no doubt -- but, there's stuff in there that anyone can take away and use. For example, the whole screenshot and composition techniques.
Also, people like Jase use 10% overlaps, from memory. You don't want such a large overlap that the blending become really visible due to having more data in the overlapping regions, and, what not. I've never done an astro one so I might be wrong, but, am going by terrestrial experience.
H
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