In a colloquium, an eminent senior professor showed a graph from a peer-reviewed journal (published by some other group). The graph contained three curves:
- black dots (blurred)
- black line (blurred)
- red line (thick and bright)
All these curves in the graph reports the same property (obtained with different methods).
When talking about the graph, the speaker mentioned, "Since the authors thought that this data (by pointing the red line) is most important, they have used red line"
My question is, is there such practice of using red-line to highlight good results in research articles?
Note: I ask this question because, in Origin Software, the first and second curve are, by default, black and red. If those colors are used, it may given an impression that the red line graph is the better result (compared to black line graph).