I am slightly confused by the labelling of the vertical axis on parton distribution function plots.(adsbygoogle = window.adsbygoogle || []).push({});

Take the one here: http://www.hep.phy.cam.ac.uk/~wjs/partons2008nlo.jpg [Broken]

as an example.

The vertical axis is labelled as xf(x, Q^2), where f is the probability density of finding a particular parton with a given longitudinal momentum fraction x.

I think it should simply be f(x, Q^2). Why the extra 'x' in front of f?

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# Parton distribution functions plot axes

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