On , both at the BBC and the New York Times.
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KooyeenHi,
would you say:
Look at the red line in/on the graph.
It isshowedshown by the red bar in/on the bar graph.
The values are represented by those blue dots in/on the chart.
I would say "in". I'd see the difference between "in" and "on" the same way as the diff