J/$\psi$ nuclear modification factor as a function of $\langle N_{\rm part} \rangle$ measured in the rapidity range $2.5 < y < 4$ for three transverse momentum intervals. The vertical bars are the statistical uncertainties and the uncorrelated systematic uncertainties are represented as boxes. The centrality-correlated systematic uncertainties are shown as filled boxes at unity. Data are compared with predictions from Ref. [26], shown as bands.