What figure are we supposed to be looking at? And what makes them beautiful, it's just the most simple line plot there could be.

disagree, it's not beautiful. Plotting curves with different ranges is very misleading (in first plot). This would be a good example of how NOT to present data.

The fact that there is technically a secret word somewhere in the legend, that allows someone to be able to decipher it, doesn't negate that the plot is poorly presented. No one should have to make the effort to go searching to understand the presentation.