File talk:Karl XIV Johan, king of Sweden and Norway, painted by Fredric Westin.jpg

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What is the grey line doing in the picture?

取自“https://commons.wikimedia.org/w/index.php?title=File_talk:Karl_XIV_Johan,_king_of_Sweden_and_Norway,_painted_by_Fredric_Westin.jpg&oldid=20201953”