Figure 4

Top: Inclusive differential $\phi$ production cross section${\rm d}^2\sigma_\phi/{\rm d}y {\rm d}\pt$, as measured via the decayinto dimuons (black triangles). The blue box onthe left represents the error on normalization The data are compared to the measurementsin the kaon decay channel by LHCb (black open circles)  Bottom: Fit to the differential cross section measured in dimuonsdivided by the cross section measured in the kaon channel by LHCb