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Hi Vasya,
Adjusting the curves and levels can be done in normal image editing software (e.g. Photoshop, Paint.NET, GIMP etc) and can be done independently of stacking in DSS or Registax.
In your case, you can simply load your final images into any of these editing programs and adjust the curves and levels. It doesn't matter if there are other objects in the picture. This will bring out more faint details and reduce the effect of light pollution.
There is alot of information on the forum and internet on post-processing using curves and levels. This is a very popular and benefical technique for processing astronomy pictures.
As a quick example, I have taken your image and adjusted the curves and levels in Paint.NET.
Cheers,
Mark
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