Production cross section of muons from heavy-flavour hadron decays as a function of rapidity in pp collisions at $\sqrt s$ = 5.02 TeV for the $\pT$ intervals $2 < p_{\rm T} < 7$ GeV/$c$ (left) and $7 < p_{\rm T} < 20$ GeV/$c$ (right). Statistical uncertainties (bars, smaller than symbols) and systematic uncertainties (boxes) are drawn. The production cross sections arecompared with FONLL predictions  (top). The ratios of the data to FONLL calculations are shown in the lower panels. See the text for details.