Display use
The images above picture the result in Siril using the Auto-Stretch rendering mode.
Advice
Note the improvement of the signal-to-noise ratio regarding the result given for one frame in the previous step (take a look to the sigma value).
The increase in SNR is of 21/5.1=4.11≈1√12=3.46 and you should try to improve this result adjusting σlow and σhigh.
Example
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