inkscape - smoothing unclean lines in GIMP - Graphic Design Stack

I scanned a line drawing and extracted the line work in Inkscape. I'm trying to clean up the image in Gimp (erasing dust specks and such), but the lines remain a bit jagged. I've tried selecting the

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In Inkscape, when I use the 'Trace Bitmap' function, how can I avoid ending up with the outline of the image when I want to get a single line sketch of the

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