LRGB 100:30:30:30 MaxIm DL used to map bad pixels, dark subtraction, alignment, then combination of the sub-exposures. Sigma reject used to combine the 10 sub-exposures of 10 minutes on Luminance channel, and median combine used for three exposures of 10 minutes for each color channel. Then MaxIm DL was used for a color combine. Photoshop was used for Levels and Curves, two iterations.