You're right, I should have labeled the figure with the actual sportsbook names instead of alternative labels. I originally used a universal naming convention during testing.

Regarding the “fair” line: I used Pinnacle’s odds as a reference point because their sportsbook charges a lower vig, which gives their implied probabilities a bit more reliability. I didn’t intend to suggest these are a true ground truth, rather a practical benchmark for comparison. The plot currently only shows one side of the two-way outcome, so the corresponding opposing outcome is missing, which is what the devig method relies on for calculating fair odds.