LibreOffice Calc: what is the width of an existing border

When I have a cell that has been formatted with a border (or different borders at different sides), how can I know what width was used for a specific border?

Right click cell with border
Click “Format cells…”
Click “Borders” tab

This doesn’t give me the information I need. In the image a cell is formatted with 4 different widths. Clicking on a border will not show it’s width in the width drop down… Oeps, don’t have enough points to upload an image…