Lines of 50, 74 and 100%:
The same lines with size 6
The 50% line at sizes 5, 10 and 15 with shading
The 50% line at sizes 5, 10 and 15 with no shading
Shaded lines of 50, 100, 150 and 200 pixels at size 6
The same lines with size 6
WARNING: Different users have different numbers of pixels on their screens.
The same 4 lines without the line feed in between: