They put an additional value of 5.5 into the top half of the chart (see it on the left-hand side). The problem is they made it just as far away from 5 as 4 is, so it visually gives Biden’s numbers a whole extra percentile gain relative to the other years on the chart.
Edit: I see this was tackled in a reasonable timeframe, which is good, but I am straight baffled why I saw the 1-day old post with just Maxwell’s question, and didn’t see anything else until I posted this belated answer.
They put an additional value of 5.5 into the top half of the chart (see it on the left-hand side). The problem is they made it just as far away from 5 as 4 is, so it visually gives Biden’s numbers a whole extra percentile gain relative to the other years on the chart.
Edit: I see this was tackled in a reasonable timeframe, which is good, but I am straight baffled why I saw the 1-day old post with just Maxwell’s question, and didn’t see anything else until I posted this belated answer.
Might help someone else—good explanation—cheers!