[Rivet] ATLAS_2012_I1084540, y label

[Sercan Sen]

Hello,

I think, it makes more sense if the "y" labels of ATLAS_2012_I1084540 plots are replaced by "$\mathrm{d}{\sigma} / \mathrm{d}{\Delta\eta^\text{F}}$ [mb]" -- as given in the paper (http://arxiv.org/pdf/1201.2808v2.pdf, e.g Fig.7). 

Currently, it is "YLabel=$\frac{d\sigma}{d\eta}$ [mb]" ...

Cheers, 
Sercan