|I'm not sure if this is what you are looking for, but with a Line Chart you can...|
1 - Right-click the Line
2 - Select "Format Data Series"
3 - Select "Line Color"
4 - Select "Solid Line"
5 - Use the Color drop down to choose Black.
There are also options for the Marker Fill, such as No Line and Fill with White, essentially making them "clear".
Is that what you are looking for?
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