[R] How to change the scale of the Y axis?

[feargalr]

I am currently trying to create 3 histograms from 3 sets of data and in order
to compare them I need them all to have a common scale, the Y axis is the
only place its a problem, as one histogram only goes up to 4, another 5, and
another 7 on the Y axis and obviously they all need to be in the same scale
to allow comparisons. Can anyone help?

Thanks,
Feargal

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