ach wroteWhich line below? I am not aware of any line below those links, unless you mean links which are additionally underlined.
I was talking about the next line of text. The underlining of a missing link seems to be a bit to low, the space between the underlining and the text below that link is hard to see.
It is an accessibility requirement to not convey meaning through colour alone. In this case e.g. colour-blind people wouldn't be able to tell the difference between the red and green links.
Ups! Yes, of course. That's a good reason for the underlining. I did not think about that. Sorry!