# Does red-line curve denotes better result in a graph? [closed]

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:

1. black dots (blurred)
2. black line (blurred)
3. 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).

## closed as off-topic by Herman Toothrot, user3209815, Coder, E.P., BuzzOct 17 '17 at 15:03

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• why is this related to academia? – Herman Toothrot Oct 17 '17 at 12:18
• It's simply unrelated, doesn't matter that similar questions were asked before, why not ask in statsexchange? So if this plot is shown outside academia it would use a different color? – Herman Toothrot Oct 17 '17 at 12:36
• The question is related to the research practices. Thus, I believe that this question is suitable only in Academia SE. – phenomenon Oct 17 '17 at 12:57
• I think this was a joke. The black dots are data points. The black fuzzy line is a confidence interval, and the red line is the line of best fit. – Dawn Oct 17 '17 at 12:58
• Well, it makes sense that the data that the authors would like to highlight is in brighter colour. If the 3 lines were just 3 colors (red blue green), then I would not assume that the red is more important, but if all data is in blurred black color but 1, then obviously that 1 is meant to be highlighted, right? – Ander Biguri Oct 17 '17 at 13:39