Here is an example of the line on the paper starting at the top - from Broad, Medium, Fine and ending with Extra Fine.
There are many factors interacting (e.g. paper quality, style of writing, handling of the fountain pen etc.) due to this, it is not possible to measure the width of the downstroke of a nib exactly. However, the approximate data for Faber-Castell line widths is as follows:
B......1.00 - 1.10mm
M.....0.80 - 0.90mm
F......0.60 - 0.70mm
EF...0.45 - 0.55mm
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