Barcode2D.Xunit the thickness of the thinnest bar in the barcode in Mils (thousandths of an inch).
Default value: 50
Allowed values: 8 – 500 mils
This may be used to specify the X unit dimension (ie. The width of the narrowest bar) in standard mil units (NOT mm. 1 mil = 0.001 inches). Barcode should not normally be produced with an X value smaller than 10, and MUST NOT be produced with an X value smaller than 8 - or the barcode will not meet the standard specification.
More: