$\RAA$ of muons from heavy flavor decays in $2.5 < y < 4$ as a function of $\pt$, in the 0-10% (left) and 40-80% (right) centrality classes, in Pb-Pb collisions at $\sqrt{s_{\rm NN}}$ = 2.76 TeV. Vertical bars (open boxes) represent the statistical (systematic) uncertainty. The filled box centered at $\RAA$= 1 is the normalization uncertainty Horizontal bars show the bin widths.