dotted line on cigarette filters What is this line? : r/Cigarettes What is this dotted line

What is this dotted line for on the filter? : r Cigarettes I opened up a cigarette from curiosity (I dont smoke) I cut the filter part from the tobacco part and saw the upper bit of the filter had black parts and the Bioaccumulation and biological effects of cigarette litter in marine worms Scientific Reports The infrared thermal images for a burning cigarette using cellulose Download Scientific Diagram Why does the filter have small holes around it like in the picture? : r Cigarettes

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