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By your equipment listed I assume you are talking about the 294MC?
Firstly darks will show a fair bit of noise, stacking software that auto stretches will stretch a dark really hard so it looks like a mess.
The ASI294 has a characteristic "Starburst" pattern on the top right, a dimmer one top left and a dimmer one again bottom right. They look horrible under a heavy stretch but if you look at the pixel values they are not really very much.
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