He Used Winsorized Sigma Clipping tho, but with some different values In Pixel Rejection(2). Using the default Values You'll get something close to what he's showing but much fewer rejections. You can also use Linear Fit Clipping. It gives the same results as WSC but with a slope Map and with a touch of difference. I used WSC with sigma low (2.0) and Sigma high (1.8) and winsorization cutoff to Default (5.0). Got the Nearest Pixel Rejection as in the Video🙂

I got the fact he used WSC from his mention on processing the blue channel - however the parameters he used would be good to know (Hard to follow a walk through if your results are always going to be different).

(2.0) Sigma low & (1.8) Sigma high with the Winsorization Cutoff to be default (5.0). I saw that in the 2nd Video and it turned out to be the nearest I could get to what he was showing. Try it. You won't regret it for sure! and one more piece of advice. Further, in the 2nd Video, you'll go through the "Comet Subtracted" part. You'll be doing the Comet Alignment part again, so while doing that make sure that you uncheck the "Linear Fit" option. You'll thank me later for saving big time!

This was an unfortunate cut- that screen was supposed to be in my recording! If you look at the video again at Part 1 (roughly minute 24) you will see the answer to exactly my settings!