Question about additional elements on cutting files

I’m about to start cutting. When I downloaded the cutting files, I’m seen some additional lines (highlighted in light blue), that I don’t know if is part of the cut schema, or what is the purpose of those lines.

I also had the same question, and I think I found the answer.
If you look at the drawings and 3d model, you can find that the layer on which those elements are positioned is called - ANYTOOL_HALF_MILL_9MM_IN.
So, you have to mill these positions to the 9mm depth.
Screenshot attached.

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That makes a lot of sense, I had not seen it, thanks for the answer

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