That's a good question.
I think that what it comes down to, is what's standard, but since your audience is from different countries where the standards are different, it would be best to post results with both standards.
But you don't want to post two graphs showing the same results, so you'd have to come up with a way to use the horizontal scale at the bottom as english measurements, and the top horizontal as metric, and the same for the vertical axes (left: english, right metric). You'd also need a line for the metric measurements with regular cross marks.
The thing is, you'd be hard pressed to trick Excel into doing this.
You need a program that can do that for you. Got any VBB skills?
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