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my thoughts on this is that there are 3 main ways that you combine data, median, mean and sum. assuming you had many short subs and one long sub wouldn't it just have the following effect
Median - the long data will be completely rejected
Mean - the darker areas will be brightened slightly, the core will not be impacted much and the overall effect will be that you wont see much of a difference because it is diluted by all other data
Sum - the overall image will look similar to your long sub with, you will have noise issues because the majority of the image data will be from a single source
i could be completely wrong, feel free to correct me.
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