But the small screen example also has a problem that will increas the error rate of the eye movement. The distance between words are much to big in many places compared to the distance between the lines.
If you use LaTeX and default settings you know how a readable document should look. But people seem to think that the wide margins is something bad and they increas the line length and the legibility decreases.
Another rule of thumb for line length is 60-70 characters.
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